Among the textiles made by pre-Columbian weavers in Peru are double-faced warp-faced bands, with two or more differently colored yarns in each warp location, where figures woven on one face appear, by warp substitution, in a different color on the other. Andean weavers reconciled this difference with the aesthetic concern that the two faces be as similar as possible by exploiting the symmetries of colored strip patterns.

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