Artists and designers use color wheels regularly as a tool to mix, determine, and pick colors confidently. Color wheels are arranged in the shape of a circle in the order of how colors are represented in the light color spectrum. Painters, unlike printers, typically base their color wheels off of the primary colors: red, blue, and yellow. Isaac Newton invented the first color wheel in 1666, and since then artists have studied and designed other wheels based on Newton's concept. Most color wheels have a total of 12 main divisions, but some have 24.