The café wall illusion is an optical illusion produced by a black and white rectangular tessellation when the tiles are shifted in a zigzag pattern. While the pattern seems to diverge towards the upper and lower right corners in the upper figure, the gray lines are actually parallel. Interestingly, the illusion greatly diminishes if black lines are used instead of gray.
The image above shows a picture of a building in Melbourne, Australia designed to exhibit this illusion (C. L. Taylor, pers. comm., Aug. 5, 2006). The building, completed in 2006, is part of Melbourne's Digital Harbour Port 1010 and houses the Australian Customs Service (Ashton Raggatt McDougall 2006).
Source: http://mathworld.wolfram.com/CafeWallIllusion.html
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