colour wheel, a diagram used in the visual arts to represent the colours of the visible spectrum and their relationships to one another. The colours are arranged systematically into a circle, with each hue usually falling into one of three categories: primary, secondary, or intermediate. In fields such as painting, fashion, film, and design, artists use the colour wheel to assemble colour schemes and visualize how colours appear beside one another. There are a number of colour wheels, each representing a different colour system. Colour systems are based on three primary colours from which all other colours in the system
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