Vitruvian opening

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

The prototypical Vitruvian opening at the Temple of Vesta

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.[1]

References
  1. Curl, James Stevens; Wilson, Susan (2016). Oxford Dictionary of Architecture. Oxford University Press. p. 814. ISBN 978-0-19-967499-2.
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