The differences between the pigment color wheel and artist color wheel is shown; subtracting or adding the colors. They also introduced 2 more color wheels: The process wheel and the light wheel.  Throughout these new color wheels, primary  colors are added to the wheels; The artist color wheel adds green to one of their primaries. The process wheel had violet as one of their primary colors, etc. How we all differentiate each color wheel is confusing but very beneficial because they all work different under different circumstances; printing, painting, typing, etc.