The Staircase by Leandro Erlich

Argentinian artist Leandro Erlich is a master at creating roomful of illusions, like this piece above called The Staircase (2005).

Previously on Neatorama: Leandro Erlich’s Bâtiment. See also his work called "The Pool," where water is simulated by use of a piece of glass (the people in the room below become part of the exhibit!) – Thanks Shihui!