![]() ![]() Thomas Young postulated that the eye contains receptors that respond to three different primary sensations, or spectra of light. Color scientists and psychologists often use the additive primaries, red, green, and blue and often refer to their arrangement around a circle as a color circle as opposed to a color wheel. Most later color circles include the purples, however, between red and violet, and have equal-sized hue divisions. The divisions of Newton's circle are of unequal size, being based on the intervals of a Dorian musical scale. ![]() The original color circle of Isaac Newton showed only the spectral hues and was provided to illustrate a rule for the color of mixtures of lights, that these could be approximately predicted from the center of gravity of the numbers of "rays" of each spectral color present (represented in his diagram by small circles). In his book Opticks, Isaac Newton presented a color circle to illustrate the relations between these colors. ![]()
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