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davidbriggs · 3714 days ago · link · · parent · post: Why is it a Color “Wheel” and Not a Color “Line”? | Eye Math
The answer is physiological. According to the zone theory of colour vision, colour does not reside in the linear spectrum but is created by the visual system in the form of two opponent signals, red vs green and yellow vs blue. With their four possible combinations these create a circular range of hues: red, red and yellow, yellow, yellow and green, green, green and blue, blue, blue and red. When all wavelengths are present the red vs green and yellow vs blue opponent signals both cancel out, and we see the light as white: http://www.huevaluechroma.com/036.php