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Gradient RGB/CMY color wheel Seven-color and twelve-color color circles from 1708 (attributed to Claude Boutet) Wilhelm von Bezold's 1874 Farbentafel. A color wheel or color circle [1] is an abstract illustrative organization of color hues around a circle, which shows the relationships between primary colors, secondary colors, tertiary colors etc.
The two orange circles are exactly the same size; however, the one on the right appears larger. The Ebbinghaus illusion or Titchener circles is an optical illusion of relative size perception.