"Why do two colors, put one next to the other, sing? Can one really explain this? no. Just as one can never learn how to paint."

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Color is crucial in painting, but it is very hard to talk about. There is almost nothing you can say that holds up as a generalization, because it depends on too many factors: size, modulation, the rest of the field, a certain consistency that color has with forms, and the statement you're trying to make.

— Roy Lichtenstein