As you move your eyes around the image, dark dots quickly appear and disappear at the intersections. However, whenever you look directly on any intersection, the dark dots vanish.For years it was widely believed that the illusion worked because of 'lateral inhibition' - the term used to describe the complex way in which the cells on the back of the retina respond to areas of black and white.
A few years ago this explanation was shown to be completely untrue, and so the explanation for the illusion remains a mystery.
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