Ewald Hering found a clue to the mystery of color vision in

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Ewald Hering found a clue to the mystery of color vision in afterimages, specifically in the discovery of complementary colors. He noticed that staring at one color for an extended period of time would lead to an afterimage of the complementary color. This led to the development of the opponent process theory of color vision, which suggests that color vision is based on three opposing color pairs: red-green, blue-yellow, and black-white.

Ewald Hering Found a Clue to the Mystery of Color