A gallery of nine classic optical illusions — the checker-shadow contrast trick, Ebbinghaus, Muller-Lyer, Ponzo, the cafe wall, the Hermann grid, Kitaoka's rotating snakes, a color afterimage, and Rubin's vase. Every one comes with a real 'prove it' button that measures pixels, overlays a ruler, or compares two frames on the spot, so you can see exactly why your eyes were fooled.
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