This tricky visual illusion is also known as a Penrose stair, named after its discoverers, Lionel and Roger Penrose. Hiroyuki Isobe and a team at Tohoku and Tsukuba University ...

Similar to M.C. Escher's "Ascending and Descending" and the Penrose stairs, which are both two-dimensional renderings, the illusion by Kokichi Sugihara invites the viewer to first interpret the 3D ...

Penrose Stairs is an optical illusion. It is a two-dimensional depiction of a structure representing a flight of steps, but, as Lionel and Roger Penrose described “the connexions ...

A ‘Penrose stairs’ optical illusion, or impossible staircase. Credit: Sakurambo on Wikipedia.

Similar to M.C. Escher's "Ascending and Descending" and the Penrose stairs, which are both two-dimensional renderings, the illusion by Kokichi Sugihara invites the viewer to first interpret the 3D ...