This optical illusion, containing over 20 "errors", was engraved by the English painter William Hogarth in 1754. How many error can you find?
by William Hogarth
"Penrose Tribar", also known as "Penrose Triangle", is an impossible object. Even though Oscar Reutersvard originally created it, the figure was later independently devised and popularized by Roger Penrose and his son.
by Oscar Reutersvard
Artistic interpretation of the "Penrose Triangle", this image contains more irregularities than you initially notice.
This is an example of "endless stairs" - an impossible object.
by Roger Penrose
Based on the Penrose Stairs illusion and inspired by Escher's "Ascending and Descending" etching, this digitally altered image depicts cleaners doing their job in Basilique du Sacré Coeur, an Art Deco cathedral in Brussels.