"It is not by his mixing and choosing, but by the shapes of his colors, and the combination of those shapes, that we recognize the colorist. Color becomes significant only when it becomes form."

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It seems obvious that colors vary according to lights, because when any color is placed in the shade, it appears to be different from the same color which is located in light. Shade makes color dark, whereas light makes color bright where it strikes.

— Leon Battista Alberti