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In medieval times people didn’t wear polka dots. It’s difficult to get polka dots evenly spaced without a machine. Random spots were associated with diseases like the plague, leprosy, small pox, syphilis and the measles. Polka dots also create figure-ground confusion. Medieval people read the colors in clothing in layers. They could not distinguish which was the first and which was the second layer. For this same reason, stripes were also taboo.