Vitruvian opening

{{Short description|Window or frame that widens from top to bottom}}

File:TivoliVillaGregorianaTempioDiVesta2.JPG

A Vitruvian opening is a window or frame that is slightly larger at the bottom than the top.

The term was first described by Vitruvius and mentioned by Andrea Palladio, referring to a window at the Temple of Vesta at Tivoli. The term Tivoli window is also used.{{cite book |last1=Curl |first1=James Stevens |last2=Wilson |first2=Susan |title=Oxford Dictionary of Architecture |date=2016 |publisher=Oxford University Press |isbn=978-0-19-967499-2 |page=814}}