sentences:  Square repeating units of known patterns can be copied as templates, and historic pattern books may have been intended for use in this way.The 15th century Topkapı Scroll explicitly shows girih patterns together with the tilings used to create them.A set of tiles consisting of a dart and a kite shape can be used to create aperiodic Penrose tilings, though there is no evidence that such a set was used in medieval times.