broken space diagonal

In a magic cube, a broken space diagonal is a sequence of cells of the cube that follows a line parallel to a space diagonal of the cube, and continues on the corresponding point of an opposite face whenever it reaches a face of the cube.{{citation|title=World of mathematics, Volume 2|first=Brigham|last=Narins|publisher=Gale Group|year=2001|isbn=9780787650650|page=391}}.{{citation|title=The Zen of Magic Squares, Circles, and Stars: An Exhibition of Surprising Structures across Dimensions|first=Clifford A.|last=Pickover|authorlink=Clifford A. Pickover|publisher=Princeton University Press|year=2003|page=178|isbn=1400841518 |url=https://books.google.com/books?id=-mu8O8RMG6QC&pg=PA178}}. The corresponding concept in two-dimensional magic squares is a broken diagonal.