Stare at a piece of colored paper for 45 seconds or, so. Then look at a white surface. Because the cones in your retina receptive to the color of the paper have become fatigued, you see an afterimage of the complementary color when you look at the white area. This is because the fatigued cones send a weaker signal to the brain. All the colors produce white, but all the colors minus one produce the color complementary to the missing one.
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