Zahiriya madrasah, Damascus

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 30°.
• Contains two equilateral triangles.
• Contains three regular hexagons.
• Contains one regular four-pointed star polygon with vertex angle of 60°.
• Contains one regular 6-pointed star polygon with vertex angle of 60°.
• There are four non-regular reflective tiles (including one kite).
• The tiling satisfies the interlace condition and has no finite interlace and three infinite interlaces with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 195 polygons.

1. Page 81, Figure 104 (Madrasah al-Zahiriye. Damascus, Syria. Pattern over door, no effective colouring in the original) of Dominique Clévenot. Ornament and decoration in Islamic architecture, Thames & Hudson, Pressmark 604.AB.0178, 2000. ISBN 050051032. [clevenot] {Photographs by Gérard Degeorge}(1279AD, 677AH)
2. Figure 198, page 200 (Cairo, Egypt. Example of Pierced Windows (Qamariyyah) After Prisse d'Avennes, No colouring) of Martin S. Briggs. Muhammadan architecture in Egypt and Palestin, Oxford, Clarendon Press, Pressmark 32.F.79, 1924. [briggs] {255p}
3. Internet photo 169 ( qaisun interior window decoration 14thc) of Prisse d'Avennes. Arabic Art in Color, Dover, 1877. ISBN 048623658. [d-avennes] {Contains 25 geometric patterns in colour, and gives the source in most cases more on the Internet.} Fuller version available on Internet.

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