sentences:  Drawings such as shown on this scroll would have served as pattern-books for the artisans who fabricated the tiles, and the shapes of the girih tiles dictated how they could be combined into large patterns.In this way, craftsmen could make highly complex designs without resorting to mathematics and without necessarily understanding their underlying principles.This use of repeating patterns created from a limited number of geometric shapes available to craftsmen of the day is similar to the practice of contemporary European Gothic artisans.