zellij

The word zillīj ({{Lang|ar|زليج}}) is derived from the verb zalaja ({{Lang|ar|زَلَجَ}}) meaning "to slide,"{{Cite web|title=تعريف و شرح و معنى زليج بالعربي في معاجم اللغة العربية معجم المعاني الجامع، المعجم الوسيط ،اللغة العربية المعاصرة ،الرائد ،لسان العرب ،القاموس المحيط - معجم عربي عربي صفحة 1|url=https://www.almaany.com/ar/dict/ar-ar/%D8%B2%D9%84%D9%8A%D8%AC/|last=Team|first=Almaany|website=www.almaany.com|language=en|access-date=2020-05-29}} in reference to the smooth, glazed surface of the tiles. The word azulejo in Portuguese and Spanish, referring to a style of painted tile in Portugal and Spain, derives from the word zillīj.{{cite dictionary|title=azulejo – definition of azulejo in Spanish|url=https://es.oxforddictionaries.com/definition/azulejo|publisher=Oxford University Press|archive-url=https://web.archive.org/web/20190408214103/https://es.oxforddictionaries.com/definition/azulejo|archive-date=8 April 2019|access-date=8 April 2020|dictionary=Oxford Living Dictionaries}}{{cite web|title=Azulejos: gallery and history of handmade Portuguese and Spanish tiles|url=http://www.azulejos.fr/index_en.html|work=www.azulejos.fr|access-date=8 April 2020}} In Spain, the mosaic tile technique used in historical Islamic monuments like the Alhambra is also referred to as alicatado, a Spanish word deriving from the Arabic verb qata'a ({{Lang|ar|ﻗَﻄَﻊَ}}) meaning "to cut".{{Cite book |last1=Degeorge |first1=Gérard |url=https://books.google.com/books?id=VynrAAAAMAAJ&q=zellij+alicatado |title=The Art of the Islamic Tile |last2=Porter |first2=Yves |publisher=Random House Incorporated |year=2002 |isbn=978-2-08-010876-0 |pages=24 |language=en}}{{Rp|page=166}}

File:Panneau de mosaïque en faïence Kalâa des Béni Hammad.jpg (present-day Algeria), 11th century]]

The technique of mosaic tilework was probably inspired or derived from Byzantine mosaics and then adapted by Muslim craftsmen for faience tiles.{{Rp|page=28}} Fragments of zellij tilework from al-Mansuriyya (Sabra) in Tunisia, possibly dating from either the mid-10th century Fatimid foundation or from the mid-11th Zirid occupation, suggest that the technique may have developed in the western Islamic world around this period. Georges Marçais argued that these fragments, along with similar decoration found at Mahdia, indicate that the technique likely originated in Ifriqiya and was subsequently exported further west.{{Rp|pages=99, 335}}

By the 11th century, the zellij technique had reached a sophisticated level in the western Islamic world, as attested in the elaborate pavements found at the Hammadid capital, Qal'at Bani Hammad, in Algeria.{{cite book |author1=Jonathan Bloom |chapter-url=https://books.google.com/books?id=un4WcfEASZwC&pg=PA201 |title=Grove Encyclopedia of Islamic Art & Architecture |author2=Sheila S. Blair |author3=Sheila Blair |publisher=Oxford University Press |year=2009 |isbn=978-0-19-530991-1 |page=201 |chapter=Architecture; X. Decoration; B. Tiles}} Modern excavations here have uncovered a series of interlocking tiles including cross-shaped lustre-painted tiles and eight-pointed star-shaped tiles of monochrome green or turquoise. Found in palaces built between 1068 and 1091, these might be attributable to Ifriqiyan craftsmen who fled the Banu Hilal invasions to the east and sought refuge with the Hammadids around this time,{{Cite book |last1=Ettinghausen |first1=Richard |url=https://books.google.com/books?id=l1uWZAzN_VcC&pg=PA275 |title=Islamic Art and Architecture: 650–1250 |last2=Grabar |first2=Oleg |last3=Jenkins-Madina |first3=Marilyn |publisher=Yale University Press |year=2001 |isbn=9780300088670 |edition=2nd |pages=275–277 |language=en}} though the lustre tiles may have been imported from elsewhere.{{Rp|page=93}} In general, the Hammadid palaces made greater use of glazed ceramic architectural decoration than earlier Islamic architecture and may have played a role in promoting this architectural fashion to the rest of the western Islamic lands.

File:Morocco - Marrakech - mosque tiles (49131613737).jpg in Marrakesh (modern restoration of original 12th-century tiles)]]

During the subsequent Almohad period, prominent bands of ceramic decoration in green and white were features on the minarets of the Kutubiyya Mosque and the Kasbah Mosque of Marrakesh. Relatively simple in design, they may have reflected artistic influences from Sanhaja Berber culture.{{Rp|231}} Jonathan Bloom cites the glazed tiles on the minaret of the Kutubiyya Mosque, dating from the mid-12th century, as the earliest reliably-dated example of zellij in Morocco.{{Cite book |last1=Bloom |first1=Jonathan |url=https://www.metmuseum.org/art/metpublications/The_Minbar_from_the_Kutubiyya_Mosque |title=The Minbar from the Kutubiyya Mosque |last2=Toufiq |first2=Ahmed |last3=Carboni |first3=Stefano |last4=Soultanian |first4=Jack |last5=Wilmering |first5=Antoine M. |last6=Minor |first6=Mark D. |last7=Zawacki |first7=Andrew |last8=Hbibi |first8=El Mostafa |publisher=The Metropolitan Museum of Art, New York; Ediciones El Viso, S.A., Madrid; Ministère des Affaires Culturelles, Royaume du Maroc |year=1998 |isbn= |location= |pages=}}{{Rp|26}} The individual tile pieces are large, allowing the pattern to be visible from afar. Each piece was pierced with a small hole prior to being baked so that the tiles could be affixed by nails to a wooden frame set into a mortar surface on this part of the minaret.{{Cite book |title=Maroc médiéval: Un empire de l'Afrique à l'Espagne |publisher=Louvre éditions |year=2014 |isbn=9782350314907 |editor-last=Lintz |editor-first=Yannick |location=Paris |editor-last2=Déléry |editor-first2=Claire |editor-last3=Tuil Leonetti |editor-first3=Bulle}}{{Rp|page=329}} The minaret of the Kasbah Mosque, built slightly later in the 1190s, makes greater use of ceramic decoration generally, including geometric mosaics on the upper parts of the minaret in the same technique as those of the Kutubiyya (though slightly more varied in design).{{efn|Different types of tiles are also used on the Kasbah Mosque's minaret. Green ceramic revetment is used within the sebka-patterned brickwork on the minaret's flanks, a blue-violet revetment covers the small engaged columns below this, and a band of square tiles in the cuerda seca technique formed an epigraphic frieze along the top. The epigraphic frieze is no longer present today; only a few preserved fragments were found in the 1920s, of which one remains in the reserve collection of the Badi Palace museum.{{Rp|page=|pages=330, 332}}}} The tiles on both minarets today are modern reproductions of the originals, of which fragments have been preserved in the reserve collection of the Badi Palace museum.{{Rp|page=|pages=326–333}}

File:Alhambra Mirador of Lindaraja DSCF6953 crop.jpg in the Alhambra (14th century)]]

The more complex zellij style that we know today became widespread during the first half of the 14th century under the Marinid, Zayyanid, and Nasrid dynastic periods in Morocco, Algeria, and al-Andalus.{{Rp|pages=335–336}}{{Cite book |last1=Touri |first1=Abdelaziz |title=Le Maroc andalou : à la découverte d'un art de vivre |last2=Benaboud |first2=Mhammad |last3=Boujibar El-Khatib |first3=Naïma |last4=Lakhdar |first4=Kamal |last5=Mezzine |first5=Mohamed |publisher=Ministère des Affaires Culturelles du Royaume du Maroc & Museum With No Frontiers |year=2010 |isbn=978-3902782311 |edition=2}} Due to the significant cultural unity and relations between al-Andalus and the western Maghreb, the forms of zellij under Marinid, Nasrid, and Zayyanid patronage are extremely similar.{{Rp|pages=188–189}} In Ifriqiya (Tunisia), under the Hafsid dynasty, zellij tiling largely fell out of style during this same period and was replaced by a preference for stone and marble paneling.{{Rp|pages=486–487}}

Zellij tiling was most typically used to pave floors and to cover the lower walls inside buildings. Zellij was also used on the exterior of minarets and on some entrance portals. Geometric motifs predominated, with patterns of increasing complexity being formed during this period. Less frequently, vegetal or floral arabesque motifs were also created. On walls, zellij geometric dadoes were commonly topped by an epigraphic frieze. By this period, more colours were employed such as yellow (using iron oxides or chrome yellow), blues, and a dark brown manganese colour.{{Rp|336}} This style of tile mosaic, formed by assembling a large number of small hand-cut pieces to form a pattern, is evident in famous buildings of the period such as the Alhambra palaces of the Nasrids, the mosques of Tlemcen, and the Marinid madrasas of Fez, Meknes, and Salé. It is also found in some Christian Spanish palaces of the same period who employed Muslim or Mudéjar craftsmen, most notably the Alcazar of Seville, whose 14th-century sections are contemporary with the Alhambra and contain zellij tilework in the same style, although of slightly lesser sophistication.{{Rp|pages=63–64}}{{Rp|page=172}} File:Chellah DSCF7049.jpg (14th century), in bright colours and floral motifs that may have been a hallmark of craftsmen from Tlemcen{{Rp|page=206}}|left]]Among the most exceptional surviving examples of Nasrid zellij art are the dadoes of the Mirador de Lindaraja and the Torre de la Cautiva in the Alhambra, both from the 14th century. Whereas Arabic epigraphy was usually carved in stucco or painted on larger square tiles, these two examples contain very fine Arabic inscriptions in Naskhi script that are made from the assembly of coloured tile pieces cut in the form of the letters themselves and set into a white background.{{Cite book |last=López |first=Jesús Bermúdez |title=The Alhambra and the Generalife: Official Guide |publisher=TF Editores |year=2011 |isbn=9788492441129 |location= |pages=146, 195–196 |chapter=}} The tiles of the Torre de la Cautiva are further distinguished by the use of a purple colour which is unique in architectural zellij decoration. The dado of the Mirador of Lindaraja also contains a particularly advanced geometric composition with very fine mosaic pieces below the level of the inscription.{{Cite book |last=Makovicky |first=Emil |url=https://books.google.com/books?id=6uLVDAAAQBAJ&dq=tiles+mirador+lindaraja+alhambra+7.15&pg=SA7-PA14 |title=Symmetry: Through the Eyes of Old Masters |publisher=Walter de Gruyter GmbH & Co KG |year=2016 |isbn=978-3-11-041719-7 |language=en}} Some of the tile pieces in this composition measure as little as 2 millimeters in width.{{Rp|page=129}}

In addition to zellij work further west, a somewhat distinctive style of zellij with brightly coloured pieces, often in floral patterns of palmettes and scrollwork, developed among the craftsmen of Tlemcen. The most important early example of this style was the decoration of the Tashfiniya Madrasa (no longer extant), founded by Abu Tashfin I (r. 1318–1337). This type subsequently appeared in later monuments of this era, mainly in Tlemcen (such as the Mosque and madrasa of Abu Madyan) but also further afield in the Marinid madrasa of Chellah, suggesting that the same workshop of craftsmen may have been employed by the Marinids around this time.{{Cite book |last=Bloom |first=Jonathan M. |url=https://books.google.com/books?id=IRHbDwAAQBAJ&q=Islamic+Palace+Architecture+in+the+Western+Mediterranean&pg=PP1 |title=Architecture of the Islamic West: North Africa and the Iberian Peninsula, 700–1800 |publisher=Yale University Press |year=2020 |isbn=9780300218701 |location= |pages=}}{{Rp|page=|pages=187, 195, 206}}{{Rp|page=526}}{{Cite book |last=Charpentier |first=Agnès |title=Tlemcen médiévale: urbanisme, architecture et arts |publisher=Éditions de Boccard |year=2018 |isbn=9782701805252 |language=fr}} The use of zellij decoration on entrance portals, otherwise not common in the rest of the Maghreb, was also most characteristic of the architecture of Tlemcen.{{Rp|page=178}} Today, the archaeological museum of Tlemcen contains many remains of panels and fragments of zellij from various medieval monuments dating back to the Zayyanid dynasty.{{Cite journal |last1=Charpentier |first1=Agnès |last2=Terrasse |first2=Michel |last3=Bachir |first3=Redouane |last4=Ben Amara |first4=Ayed |date=2019-12-31 |title=Palais du Meshouar (Tlemcen, Algérie) : couleurs des zellijs et tracés de décors du xive siècle |url=https://journals.openedition.org/archeosciences/6947 |journal=ArcheoSciences. Revue d'archéométrie |volume=43-2 |language=fr |issue=43 |pages=265–274 |doi=10.4000/archeosciences.6947 |s2cid=242181689 |issn=1960-1360}}

File:Panel de cerámica (52341035906).jpg-style technique from an epigraphic frieze of the Bou Inania Madrasa in Fez (14th century)]]

The epigraphic friezes in Marinid tilework, which typically topped the main mosaic dadoes, were made through a different technique known more widely as sgraffito (from the Italian word for "scratched"{{Cite web |date=16 May 2014 |title=sgraffito {{!}} art {{!}} Britannica |url=https://www.britannica.com/art/sgraffito |access-date=2022-10-06 |website=Encyclopedia Britannica |language=en}}).{{Rp|page=67}} In this technique, square panels were glazed in a black colour and the glaze was then chipped away around the desired motif, leaving the Arabic inscription and other decorative flourishes in black relief against a bare earth ground.{{Cite book |last=Cambazard-Amahan |first=Catherine |title=Zillīǧ: L'Art de la Céramique Marocaine |publisher=Garnet Publishing Limited |year=1992 |isbn=1873938497 |pages=135–155 |language=fr |chapter=Zillīǧ: Origines et Schémas de Composition au Temps des Mérinides}}{{Rp|page=138}}{{Cite book |url=https://www.metmuseum.org/art/metpublications/Masterpieces_from_the_Department_of_Islamic_Art_in_The_Metropolitan_Museum_of_Art |title=Masterpieces from the Department of Islamic Art in The Metropolitan Museum of Art |year=2011 |publisher=The Metropolitan Museum of Art |isbn=9781588394347 |editor-last=Ekhtiar |editor-first=Maryam D. |editor-last2=Soucek |editor-first2=Priscilla P. |editor-last3=Canby |editor-first3=Sheila R. |editor-last4=Haidar |editor-first4=Navina Najat}}{{Rp|page=74}}{{Rp|page=336}}{{Cite book |last1=Degeorge |first1=Gérard |title=The Art of the Islamic Tile |last2=Porter |first2=Yves |publisher=Flammarion |year=2001 |isbn=208010876X |language=en |translator-last=Radzinowicz |translator-first=David}}{{Rp|page=67}} Occasionally the earth background is covered with a white coating, and on some occasions a green glaze is used instead of black in order to leave a green motif in relief. An example of the latter is seen on the ceramic decoration of the minaret of the Bou Inania Madrasa in Fez (1350–1355), within the sunken spaces of the sebka motif.{{Rp|page=336}}

In the 16th century most of North Africa came under Ottoman rule. In Algeria, the indigenous zellij style was mostly supplanted by small square tiles imported from Europe – especially from Italy, Spain, and Delft – and sometimes from Tunis. Some examples of more traditional mosaic tiles found in this late period may have continued to be produced in Tlemcen.{{Rp|page=449}} In Tunisia, another style of tile decoration, Qallaline tiles, became common during the 18th century and was produced locally. It consisted of square panels of fixed size, painted with scenes and flowers, in a technique similar to Italian maiolica rather than to the earlier mosaic technique.{{Rp|page=487}}{{Rp|pages=84–86}}

File:Panel of 4 cuenca tiles MET sf33 46.jpg{{Cite web |title=Panel of 4 cuenca tiles |url=https://www.metmuseum.org/art/collection/search/197345 |access-date=2022-10-06 |website=MET Museum}}]]

In Spain, where former Muslim-controlled territories had come under Christian rule, new techniques of tilemaking developed. As wealthy Spaniards favoured the Mudéjar style to decorate their residences, the demand for mosaic tilework in this style increased beyond what tilemakers could produce, requiring them to consider new methods.{{Rp|page=102}} Towards the late 15th and early 16th centuries Seville became an important production center for a type of tile known as cuenca ("hollow") or arista ("ridge"). In this technique, motifs were formed by pressing a metal or wooden mould over the unbaked tile, leaving a motif delineated by thin ridges of clay that prevented the different colours in between from bleeding into each other during baking. This was similar to the older cuerda seca technique but more efficient for mass production.{{Rp|pages=64-65}}{{Rp|page=102}}{{Cite book |title=The Grove Encyclopedia of Decorative Arts |publisher=Oxford University Press |year=2006 |isbn=9780195189483 |editor-last=Campbell |editor-first=Gordon |pages=293, 471 |language=en |chapter=}} The motifs on these tiles imitated earlier Islamic and Mudéjar designs from the zellij mosaic tradition or blended them with contemporary European influences such as Gothic or Italian Renaissance.{{Rp|page=102}}{{Rp|pages=64-65}}{{Cite book |last=Frothingham |first=Alice Wilson |url=https://books.google.com/books?id=YIwVAQAAIAAJ&q=cuenca+y+arista+tiles |title=Tile Panels of Spain, 1500-1650 |date=1969 |publisher=order of the trustees, Hispanic Society of America |isbn=978-0-87535-110-0 |pages=xiii |language=en}} Fine examples of these tiles can be found in the early 16th-century decoration of the Casa de Pilatos in Seville.{{Rp|pages=|page=65}} This type of tile was produced well into the 17th century and was widely exported from Spain to other European countries and to the Spanish colonies in the Americas.{{Rp|page=102}}File:Μαυσωλείο των Σααντί 1048 (zellij crop).jpg (late 16th century), using a different colouring method and thinner individual pieces for finer patterns|left]]In Morocco, existing architectural styles were perpetuated with relatively few outside influences.{{Rp|page=243}} Here, traditional zellij continued to be used after the 15th century and continues to be produced up to the present day.{{Rp|page=|pages=414–415}} Under the Saadi dynasty in the 16th century and in subsequent centuries, the usage of zellij became even more ubiquitous within Morocco and covered more and more surfaces.{{Rp|page=415}} During the reign of the 'Alawi sultan Moulay Isma'il (1672–1727), zellij was used extensively on the facades of the monumental gates of the new imperial citadel in Meknes.{{Rp|page=78}}

Under the Saadis, the complexity of geometric patterns was increased for the decoration of the most luxurious buildings, such as the Badi Palace (now ruined).{{Cite book |last=Salmon |first=Xavier |title=Marrakech: Splendeurs saadiennes: 1550-1650 |publisher=LienArt |year=2016 |isbn=9782359061826 |location=Paris}}{{Rp|page=268}} Some of the zellij compositions in the Saadian Tombs are among the best examples of this type in situ.{{Rp|pages=194–200}}{{Rp|page=415}} In this example, craftsmen employed finer (thinner) mosaic pieces and the thin, linear pieces that form the strapwork are coloured whereas the larger pieces that form the "background" are white. This scheme reversed the colouring pattern generally seen in older zellij (where the ground was coloured and the linear strapwork was white).{{Rp|page=415}}

Over the centuries since the Saadi period, the sgraffito technique previously used for Marinid epigraphic friezes came into more general usage in Morocco as a simpler and more economic alternative to mosaics. This type of tile was often employed on the spandrels of large gateways and portals. The motifs are often relatively simpler and less colourful than the traditional mosaic zellij style.{{Rp|page=415}} In addition to black glaze, green or blue glaze was also used in later examples of this type to obtain motifs in these colours. An example of this can be seen on the blue and green tiled façades of the Bab Bou Jeloud gate in Fez, built in 1913.{{Rp|page=138}}

File:Mekhnes Place El-Hedine Mosaique.jpg

In later centuries, the interlacing strapwork that once separated the polygons in geometric mosaics was no longer standard and Moroccan craftsmen created rosette-style geometric compositions on an increasingly large scale.{{Rp|page=152}}{{Rp|page=415}} The culmination of this latter style is visible in the palaces built during the 19th and 20th centuries. New colours were also introduced into the palette during this period, including red, a bright yellow, and dark blue.{{Rp|page=152}} Zellij was employed on a wider array of architectural elements. The geometric rosette motifs were used to decorate fountains (or the ground around a fountain), the spandrels of arched doorways, or wall surfaces framed by arches of carved stucco. Simpler checkerboard-like motifs were used as backgrounds for the rosette compositions or to cover other large surfaces. In more modern houses and mansions, even cylindrical pillars were covered in tilework up to the level of the capital.{{Rp|page=415}}

In Morocco today, zellij art form remains one of the hallmarks of Moroccan cultural and artistic identity{{Cite journal |last=Shafer |first=Ann |date=2019 |title=No man is an island: globalisation and resilience in the Fez zillīj tradition |url=https://www.tandfonline.com/doi/full/10.1080/13629387.2018.1483877 |journal=The Journal of North African Studies |volume=24 |issue=5 |pages=758–785 |doi=10.1080/13629387.2018.1483877 |s2cid=149949424}} and continues to be used in modern Moroccan architecture.{{Rp|page=41}} Fez remains its most important center of production.{{Cite book |last=Erzini |first=Nadia |title=Zillīǧ: L'Art de la Céramique Marocaine |publisher=Garnet Publishing Limited |year=1992 |isbn=1873938497 |pages=174 |language=fr |chapter=L'École de Tétouan}} Workshops in other cities like Meknes, Salé and Marrakesh generally emulate the same style as the craftsmanship of Fez. The exception to this is the city of Tétouan (in northern Morocco), which since the 19th century has hosted its own mosaic zellij industry employing a technique differing from that of Fez. The patterns of traditional zellij are also still used in some Spanish decorative tiles, but in modern Spanish tiles the geometric motifs are simply painted and baked on large tiles rather than formed by mosaic.{{Rp|page=41}}

Zellij tiles are first fabricated in glazed squares, typically 10 cm per side, then cut by hand with a small adze-like hammer into a variety of pre-established shapes (usually memorized by rote learning) necessary to form the overall pattern.{{Cite book|last=Parker|first=Richard|title=A practical guide to Islamic Monuments in Morocco|publisher=The Baraka Press|year=1981|location=Charlottesville, VA}}{{Rp|page=41}}{{Rp|414}} Although the exact patterns vary from case to case, the underlying principles have been constant for centuries and Moroccan craftsmen are still adept at making them today.{{Rp|page=|pages=41–43}} The small shapes (cut according to a precise radius gauge) of different colours are then assembled in a geometrical structure as in a puzzle to form the completed mosaic. Uniquely in the city of Tétouan, zellij tiles are cut into the desired shapes before being baked. This results in a harder enamel that lasts longer, but the colours are not as bright and the tile pieces generally do not fit together as tightly as those produced in other cities like Fez.{{Rp|page=|pages=414–415}}{{Rp|page=41}}

Once baked and cut, the tiles were laid face down on the ground and assembled together into the intended pattern. The back of the tile pieces were coated together with thin layers of plaster or whitewash. Once dry, this coating bonded the tile pieces together into larger panels.{{Cite book |last=Rosser-Owen |first=Mariam |title=Islamic Arts from Spain |publisher=V&A Publishing |year=2010 |isbn=9781851775989 |pages= |language=en}}{{Rp|page=55}}{{Rp|page=33}}{{Rp|page=166}}{{Cite book |last=Damluji |first=Salma Samar |title=Zillīǧ: L'Art de la Céramique Marocaine |publisher=Garnet Publishing Limited |year=1992 |isbn=1873938497 |pages=242–349 |language=fr |chapter=Zillīǧ: Espaces architecturaux}}{{Rp|pages=287–288}} In Nasrid tilework the plaster was mixed with threads of esparto grass and cane to provide them with more tensile strength.{{Rp|page=166}} The panels were then affixed to the walls with a mortar or grout.{{Rp|page=563}}{{Rp|page=33}} In the case of the Almohad tilework on the minarets of the Kutubiyya and Kasbah Mosque in Marrakesh, the tiles were nailed to a wooden framework set into the surface of the wall behind them.{{Rp|page=330}}

File:Zellige Art2.jpg|An eight sided star tile after being cut from a tile, a mainstay of Moorish/Islamic design

File:Zellige factory-24116015119.jpg|alt=Artisan workers chipping zellige pieces, Fez, Morocco.|Artisan workers chipping zellij pieces, Fez, Morocco.

File:Zellige loose tile shapes.jpg|Loose tiles after chiseling the main glazed tile. Fez, Morocco.

File:Zellige upside-down assembly.jpg|alt=Zellige being assembled for an installation in Fez, Morocco.|Zellij being assembled for an installation in Fez, Morocco.

{{See also|Islamic geometric patterns}}

File:A classic detail of azulejos, Patio de las Doncellas.jpg in the Courtyard of the Maidens in the Alcázar of Seville. This common pattern features 12-pointed, 6-pointed, and 8-pointed stars.]]

In traditional zellij decoration, geometric patterns of varying complexity were the most prominent and widespread motif. Vegetal arabesque motifs were also used, though less frequently. Geometric patterns were created on the basis of tessellation: the method of covering a surface with the use of forms that can be repeated and fitted together without overlapping or leaving empty spaces between them. These patterns can be extended infinitely.{{Cite book |last=Bonner |first=Jay |url=https://books.google.com/books?id=o9IxDwAAQBAJ |title=Islamic Geometric Patterns: Their Historical Development and Traditional Methods of Construction |publisher=Springer |year=2017 |isbn=978-1-4419-0217-7 |language=en}}{{Cite book |last=Caruncho |first=Daniel S. |title=Tilework in the Alhambra of Granada |publisher=Dosde |year=2018 |isbn=9788491031369 |location=Barcelona |language=en |translator-last=Jones |translator-first=Cerys Giordano}}{{Rp|page=21}} In Islamic art, the most important types of tessellation in geometric motifs are based on regular polygons. This form of expression within the conceptual framework of Islamic art valued the creation of spatial decorations that avoided depictions of living things, consistent with taboos of aniconism in Islam on such depictions. Traditions of mosaic tilework were also prevalent across various periods in other parts of the Islamic world, including Iran, Anatolia, and the Indian subcontinent.{{Cite book |last=Petersen |first=Andrew |title=Dictionary of Islamic architecture |publisher=Routledge |year=1996 |isbn=9781134613663 |location= |pages=279–280 |chapter=tilework}} Whereas in the eastern Islamic world blues and turquoises were the dominant colours, in western zellij yellows, greens, black, and light brown were very common, with blues and turquoise also appearing in the mix, and they were typically set against a white ground.{{Cite book |last1=Blair |first1=Sheila |title=Islam: Art and Architecture |last2=Bloom |first2=Jonathan |publisher=h.f.ullmann |year=2011 |isbn=9783848003808 |editor-last=Hattstein |editor-first=Markus |location= |pages=448–451 |language=en |chapter=Tiles as Architectural Decoration |editor-last2=Delius |editor-first2=Peter}}

File:20151118 Morocco 2477 Fez sRGB (24188205260).jpg of Fez. This example employs a fivefold geometric system with 10-pointed stars, while also adding visual diversity through colour.]]In western Islamic art, under the Nasrid and Marinid dynasties, a great variety of geometric patterns were created for architectural decoration. Among the most common was a pattern employing six-pointed and twelve-pointed star compositions, with eight-pointed stars inserted between them.{{Rp|pages=|page=107}} A popular trend was the use of patterns based on systems of fourfold symmetry. This family of patterns was widely used in other Muslim cultures further east, but in the Maghreb and al-Andalus artists excelled at their use and introduced several innovations. One innovation was to make the repeating unit of the patterns larger, with broader compositions involving many different polygonal forms. Other innovations were the incorporation of more complex sixteen-pointed stars into some of these patterns and the insertion of further "arbitrary" design elements within the wider patterns. These innovations not only increased the complexity of the motifs but also increased their visual diversity.{{Rp|pages=107–109}} The family of patterns involving fivefold symmetry, which was widely used and developed throughout the rest of the Islamic world, was less common in the Maghreb and al-Andalus.{{Rp|page=110}} Some exceptional examples of this pattern from the Marinid period are found in the zellij tilework of the al-Attarine and Bou Inania madrasas in Fez, where greater visual diversity was once again achieved by using large repeating units.{{Rp|page=111}} In these examples and in others, additional visual diversity was also achieved through the use of colour. By varying the colours of the pieces, different patterns could be highlighted within the same geometric motif.{{Rp|page=85}}{{Rp|page=111}}

Other types of compositions were also employed, many of them much simpler. Some mosaics were simply composed of coloured squares. One variation of this is a "checkerboard"-like pattern made up of repeating squares/lozenges separated by white strips with eight-pointed stars at their intersections.{{Rp|pages=60–72}} In the Alhambra of the Nasrids, some zellij motifs were composed of interlacing ribbons or tracery, sometimes as part of a narrow frieze wrapping around doorways or running above larger zellij dadoes. Another motif distinctive to the Alhambra is the so-called "Nasrid bird" ({{Langx|es|pajarita nazarí|links=no}}), which is composed of a three-pointed star with curved arms that is repeated in a wheel-like motif. Yet another motif consists of one repeating curvilinear form resembling a double-headed axe, which is found in the Alhambra and is also common in the zellij of Tétouan in Morocco, where it is known in Arabic as the "four hammers" (arba'a matariq). A straight-lined version of this motif, similar to the 12th-century zellij on the minaret of the Kutubiyya Mosque, is also found in the Alhambra, where it is referred to in Spanish as the "bone" (hueso) motif.{{Rp|pages=22–23}}{{Rp|pages=32–36}} A darj-wa-ktaf (or sebka) motif is also employed in some Marinid tilework, including examples at the al-Attarine and Bou Inania madrasas.{{Rp|pages=138–153}}{{Rp|pages=70–71}} Numerous other tessellated motifs are attested.

An Aramco World article about zellij states:

An encyclopedia could not contain the full array of complex, often individually varied patterns and the individually shaped, hand-cut tesserae, or furmah, found in zillij work. Star-based patterns are identified by their number of points—'itnashari for 12, 'ishrini for 20, arba' wa 'ishrini for 24 and so on, but they are not necessarily named with exactitude. The so-called khamsini, for 50 points, and mi'ini, for 100, actually consist of 48 and 96 points respectively, because geometry requires that the number of points of any star in this sequence be divisible by six. (There are also sequences based on five and on eight.) Within a single star pattern, variations abound—by the mix of colors, the size of the furmah, and the complexity and size of interspacing elements such as strapping, braids, or "lanterns." And then there are all the non-star patterns— honeycombs, webs, steps and shoulders, and checkerboards.{{Cite web |last=Werner |first=Louis |date=2001 |title=Zillij in Fez |url=https://archive.aramcoworld.com/issue/200103/zillij.in.fez.htm |access-date=2022-10-02 |website=Saudi Aramco World}}

File:Zellij at the Marinid Mosque of Chella.jpg|Remains of Zellij with eight-pointed star motif, in the Marinid ruins of Chellah in Rabat, Morocco (14th century)

File:Mederssa Salé.jpg|Zellij applied to curved surfaces in the Marinid Madrasa of Salé (14th century)

File:Bou inania minaret detail.jpg|Zellij on the minaret of the Bou Inania Madrasa in Fez (14th century), with mosaic panels below and green sgraffito tiles above

File:Mosaic Louvre 74.1962.518-520 n01.jpg|Zellij fragment from Tlemcen, Algeria, from the 14th century

File:Madrasa Tachfinia 16-572162.jpg|Watercolour drawing recording various zellij patterns in the 14th-century Tashfiniya Madrasa of Tlemcen, prior to its demolition in the 19th century

File:ReconquistaAlhambra.JPG|Zellij with 16-pointed star motifs in the Mexuar of the Alhambra in Granada (14th century; with later Spanish emblem inserted in the center)

File:Alhambra wall 07 (7005708199).jpg|Zellij with checkerboard pattern with eight-pointed stars, in the Court of the Myrtles of the Alhambra

File:Alhambra Granada mjsm (32).jpg|Zellij band with interlacing motif at the entrance of the Comares Palace of the Alhambra (14th century)

File:La Alhambra (14).jpg|Zellij with so-called "Nasrid bird" motif in the Court of the Myrtles in the Alhambra (14th century)

File:Mosaico Nazarí Hueso.svg|Digital recreation of the "bone" motif, including the straight-lined (left) and curvilinear (right) variants

File:Al-Attarine Madrasa DSC 0465 (39977436372).jpg|Zellij with darj-wa-ktaf motif in the al-Attarine Madrasa in Fez (14th century)

File:مدرسة العطارين 2.jpg|Zellij paving around the fountain of the Al-Attarine Madrasa in Fez

File:مدرسة ابن يوسف.jpeg|Ben Youssef Madrasa in Marrakesh (16th century)

File:Bab Mansour2.JPG|Detail of Bab al-Mansour in Meknes (early 18th century)

File:Mellah de Tetouan 10112020 004.jpg|Example of zellij in Tétouan (on a fountain in the Mellah)

File:محكمة الباشا 20 52 01 947000.jpeg|20th-century zellij in the Mahkamat al-Pasha in Casablanca, Morocco

File:تفاصيل الزليج في مبني بنك المغرب في الدار البيضاء.jpg|alt=Edmond Brion's reinterpreted zellij at Bank Al-Maghrib in Casablanca|Edmond Brion's reinterpreted zellij at Bank Al-Maghrib in Casablanca

File:Wooden box inlaid with ivory in floral and zellige-like geometrical motifs Italy 15th century.jpg

Islamic decoration and craftsmanship had a significant influence on Western art when Venetian merchants brought goods of many types back to Italy from the 14th century onwards.{{cite book |last=Mack |first=Rosamond E. |title=Bazaar to Piazza: Islamic Trade and Italian Art, 1300-1600 |publisher=University of California Press |year=2001 |isbn=0-520-22131-1 |pages=Chapter 1}} The tessellations of zellij tilework in the Alhambra of Granada were also an important source of inspiration for the work of 20th-century Dutch artist M. C. Escher.{{Cite book |last=Calcatinge |first=Alexandru |url=https://books.google.com/books?id=FPXYAwAAQBAJ&dq=escher+alhambra&pg=PA56 |title=Critical Spaces: Contemporary Perspectives in Urban, Spatial and Landscape Studies |publisher=LIT Verlag Münster |year=2014 |isbn=978-3-643-90495-9 |pages=55–56 |language=en}}{{Cite book |last=Hvidsten |first=Michael |url=https://books.google.com/books?id=Q6iuDQAAQBAJ&dq=escher+alhambra+tiles&pg=PT240 |title=Exploring Geometry |publisher=CRC Press |year=2016 |isbn=978-1-4987-6098-0 |language=en}}{{Cite book |last=Hoffmann |first=Frank |url=https://books.google.com/books?id=16H0DwAAQBAJ&dq=escher+alhambra&pg=PA140 |title=Introduction to Crystallography |publisher=Springer Nature |year=2020 |isbn=978-3-030-35110-6 |language=en}} The tessellations in the mosaics are currently of interest in academic research in the mathematics of art. These studies require expertise not only in the fields of mathematics, art and art history, but also of computer science, computer modelling and software engineering.From Form to Content: Using Shape Grammars for Image Visualization, Source IV archive Proceedings of the Ninth International Conference on Information Visualisation (IV'05) – Volume 00, IEEE Computer Society Washington, DC, USA{{Additional citation needed|date=September 2022|reason=The cited source appears to be merely one example study that involves zellij, it is not enough to support a wider point about the importance of zellij to these disciplines.}}

In Morocco, Fez is still a production center for zellīj tiles due in part to the Miocene grey clay found in the area. The clay from this region is primarily composed of kaolinite. In Fez and in other sites including Meknes, Safi, and Salé, the composition of clay used for ceramics is 27–56% clay minerals, of which 3–29% is calcite (around 16% for Fez).{{Cite journal |last1=El Ouahabi |first1=Meriam |last2=Daoudi |first2=L. |last3=Fagel |first3=Nathalie |year=2014 |title=Mineralogical and geotechnical characterization of clays from northern Morocco for their potential use in the ceramic industry |url=https://www.researchgate.net/publication/261479494 |journal=Clay Minerals |volume=49 |issue=1 |pages=35–51|doi=10.1180/claymin.2014.049.1.04 |bibcode=2014ClMin..49...35O |s2cid=131441497 }} Quartz and muscovite are also present, at around 15–29% and 5–18%, respectively. A study by Meriam El Ouahabi, L. Daoudi, and Nathalie Fagel states that:

{{blockquote|From the other sites (Meknes, Fes, Salé and Safi), the clay mineral composition shows besides kaolinite the presence of illite, chlorite, smectite and traces of mixed layer illite/chlorite. Meknes clays belong to illitic clays, characterized by illite (54 – 61%), kaolinite (11 – 43%), smectite (8 – 12%) and chlorite (6 – 19%). Fes clays have a homogeneous composition with illite (40 – 48%). and kaolinite (18 – 28%) as the most abundant clay minerals. Chlorite (12 – 15%) and smectite (9 – 12%) are generally present as small quantities. Mixed layer illite/chlorite is present in trace amounts in all the examined Fes clay materials.{{Failed verification|date=September 2022|reason=This quote is not found in the article, although the same information is present on p. 42; unclear if this quote comes from another version of the same study or if this is in fact paraphrased.}}}}

Zellīj making is considered an art in itself. The art is transmitted from generation to generation by ma'alems (master craftsmen). A long training is required to implant the required skills and training usually starts at childhood. In Fez, craftsmen begin training between the ages of 6 and 14 and the average apprenticeship lasts approximately ten years, with many more years required to achieve the status of ma'alem. In 1993, the Moroccan government ratified the Convention on the Rights of the Child (CRC), abolishing the practice of employing children under 15 in work that is hazardous or impedes their education,{{Cite web |date=2012-11-15 |title=Lonely Servitude {{!}} Child Domestic Labor in Morocco |url=https://www.hrw.org/report/2012/11/15/lonely-servitude/child-domestic-labor-morocco |access-date=2019-05-22 |website=Human Rights Watch |language=en}} but a 2019 study reports that the practice of training children has continued. Now young people learn zellīj making at one of the 58 artisan schools in Morocco. However, the interest in learning the craft is dropping. As of 2018, at an artisan school in Fez with 400 enrolled students only 7 students learn how to make zellīj.{{Cite web |title=Crafting mosaic tile is an endangered tradition. Here are the folks keeping it alive |url=https://www.usatoday.com/story/news/world/2018/06/07/morocco-zellige-mosaic-tile-craftsmanship/660702002/ |access-date=2019-05-22 |website=USA TODAY |language=en}}

{{columns-list|* Girih tiles

• Islamic architecture
• Qashani
• Tadelakt

}}

{{notelist}}

{{Reflist}}

• at-Tanwīr wa-Diwān at-Tahbīr fi Fan at-Tastīr ({{Lang|ar|التنوير وديوان التحبير في فن التسطير}}) by Khalid Saib (in Arabic){{Cite book |last=خالد، |first=السايب، |url=https://books.google.com/books?id=_MhcuwEACAAJ&q=%D8%A7%D9%84%D8%AA%D9%86%D9%88%D9%8A%D8%B1+%D9%88%D8%AF%D9%8A%D9%88%D8%A7%D9%86+%D8%A7%D9%84%D8%AA%D8%AD%D8%A8%D9%8A%D8%B1+%D9%81%D9%8A+%D9%81%D9%86+%D8%A7%D9%84%D8%AA%D8%B3%D8%B7%D9%8A%D8%B1 |title=كتاب التنوير وديوان التحبير في فن التسطير |date=2016 |isbn=978-9954-37-649-2 |language=ar}}

{{commons category}}

• [https://www.youtube.com/watch?v=Og6cTlwBTrk The Moroccan Court in the Metropolitan Museum in New York]
• [http://www.zellige.ma/zellij-moroccan.html Zellige is kind of art which is typically Moroccan] {{Webarchive|url=https://web.archive.org/web/20161114080435/http://www.zellige.ma/zellij-moroccan.html |date=2016-11-14 }}
• [http://www.zellige.ma/Catalog-Zellij-Moroccan.html Handmade zellige and Moroccan mosaic images] {{Webarchive|url=https://web.archive.org/web/20220327153303/http://www.zellige.ma/Catalog-Zellij-Moroccan.html |date=2022-03-27 }}
• [http://moroccandesign.com/uncategorized/moroccan-mosaics-the-art-of-zillij Moroccan Mosaics: Art of Zillij (Zellige)] {{Webarchive|url=https://web.archive.org/web/20151128060034/http://moroccandesign.com/uncategorized/moroccan-mosaics-the-art-of-zillij |date=2015-11-28 }}
• [https://www.youtube.com/watch?v=vk1ALI6EZy0 Video of how zellige is made]

{{Islamic architecture}}

{{Islamic art}}

{{mathematical art}}

Category:Ceramic art

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