Artist Felice Varini is a master of anamorphic installations. He paints directly on indoor and outdoor spaces such as rooms, stairways, buildings, and more. His work requires that you view it at a specific angle, so that you can see geometric shapes.
Notes about the artist: 
Felice Varini was born in 1952 in Locarno, Switzerland. and currently lives in Paris.
[...] The paintings are characterized by a single vantage point from which the viewer can see the complete painting (usually a simple geometric shape such as circle, square, line), while various ‘broken’ fragmented shapes are seen from various other view points. Varini contends that the work exists as a whole — the complete shape as well as the fragments. “My concern,” he says “is what happens outside the vantage point of view.”
1. "Felice Varini." Demischdanant.com. Retrieved on February 10th, 2012. Photos © Felice Varini Link via Myedol