This is the back side of the Flatiron building in Toronto, Canada. The mural was done by Derek Besant and installed in 1980. The building itself was built in 1892 and is unique in its own right, view it from the front.
The mural, called Trompe.d'oille is even more unique than it looks due to two facts. 1st the mural isn't painted on the building but on a raised board attached to the building. The 2nd thing that makes this mural unique is that mural is actually painted to be a reflection of the Perkins Building, which is located directly across the street.
Tags: optical illusions,photos,illusions,art