WHAT'S HAPPENING:
Scientists studying this "twisted cord" illusion, called the Fraser Spiral, think that your brain misinterprets the straight edges of the pink, blue, and white boxes. This causes you to think that the edges are actually bent, which creates the spiral effect. Your brain processes what you see in a quick series of steps. This illusion probably happens in an early step, when your brain is trying to figure out where the edges are.
Vision scientist Al Seckel is the author of The Great Book of Optical Illusions.
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