Martin Waldbauer is a master of playful illusions. Each piece makes you do a double take, wondering if what you're seeing could be real. He says he's a total amateur, but I'm not buying it ;)

Leandro Erlich's Bâtiment Building is a mirrored installaion on display at Le 104 in Paris as part of the In_Perceptions exhibition. Erlich creates the illusion in these photos by placing a giant mirror on top of a building facade. What an awesome idea!

István Orosz is a Hungarian artist  who specializes in complex images. The ones you see here are called anamorphoses which require the viewer to use specialized devices at certain angles to see an image. It is hard to make a simple anamorphic image, but he makes creating complex anamorphoses seem effortless.