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

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Ewald Hering discovered the phenomenon of afterimages, where a person who stares at a brightly colored image for a prolonged period of time may see an image with complementary colors when they look away. This discovery helped Hering develop his opponent-process theory of color vision, which states that color perception is based on three opposing pairs of colors: blue versus yellow, red versus green, and black versus white.

Ewald Hering Found a Clue to the Mystery of Color