Here is a good test for you. Which way are the gears turning? By rights, if the top gear is going clockwise then the middle gear should be going anti-clockwise and the bottom gear clockwise. But the more you look the more they change, first one way then the other. With a little practice you can make them go anyway you want.
Optical Illusion Website
Advertizements After Image Alan Mason Anamorphosis Animation Art Auto stereograms Body Art Dali Disappearing Escher Film Fun Gianni Sarcone Hidden Historical Homage Illusions Interesting Joined Liu Bolin Luke Brown Moon Illusions Negative News Perspective Photography Photoshopping Puzzle Quiz Reverse Perspective Scary Spot The Difference Stereographic Stereokinetic Street Art Sunken Tattoo Tech Art Tribute Trompe I'oeil Upsidedown Video Weired
Why not subscribe to our Opticals page