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Rhythm is a principle of art that's difficult to summarize in words. Assuming that you've picked up on a rhythm in music before, take what you heard with your ears and try to translate that to something you'd see with your eyes. Rhythm, in art, is a visual beat.

A pattern has rhythm, but not all rhythm is patterned. For example, the colors of a piece can convey rhythm, by making your eyes travel from one component to another.