WHAT'S HAPPENING:
Scientists aren't sure what causes this illusion. But experts think slight color changes can trick the brain into thinking that an image is moving. This illusion—discovered by vision scientist Akiyoshi Kitaoka—is called "perceptual drift" because the brain perceives parts of the image to be drifting.
Vision scientist Al Seckel is the author of The Great Book of Optical Illusions.
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FAST FACT #1:
Your brain signals your eyes to blink automatically about every four seconds.
FAST FACT #2:
One complete blink takes about a third of a second.
Try Another Illusion Trick
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