Moorish remains in Spain; being a brief record of the Arabian conquest of the Peninsula - Calvert, Albert Frederick, 1872-1946. Veiw the book, here.
“The tilework on the Bukhara madrasa is an example of the stylized geometric strap-work—typically based on star or polygon shapes—that is emblematic of traditional Islamic ornamentation. This form of design is known as girih patterns, from the Persian word for “knot.” It is generally believed that such designs were constructed by drafting zigzag outlines with only a straightedge and a compass. But Lu perceived something more: “I saw five-fold and ten-fold stars, which immediately aroused my curiosity about how these tilings had been made.” He wondered how Islamic craftsmen had been able to design such elaborately symmetrical patterns centuries before the advent of modern mathematics.”
- From this article.