Also significant is that the earliest theorist on color, Empedocles, ascribed all the colors to variations between light or white, dark or black, and red and yellow, which must exist as elements in the eye in order to be perceived. This selection being fairly consistent with Homer supports the premise that earlier Greeks thought of color in only these distinctions. Aristotle and others ascribed all color to gradations of light and shadow3. Xenophanes described the rainbow as having three colors; a purple, a yellow green, and a red.
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