Half of the book comprise well-done illustrations. For example, in this book you'll find a database of tilings and patterns by various classifications schemes, all illustrated. This is a standard reference on the topic, and no other book approaches its scope or depth. This will probably remain so a few years after 2000. Anyone can also benefit from the book by its vast illustrations.
Some sections are suitable for nonprofessionals.
A 10 page article, about 4 pages are photos and illustrations. This article is non-mathematical. It look at traditional Moorish patterns through mathematics. For example, it discusses what symmetry patterns are found, how to analize them mathematically, and problems in analyzing them with symmetry. This is a good article.