Qalawun, Cairo

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 7.5°.
• Contains one regular octagon.
• Contains one regular four-pointed star polygon with vertex angle of 30°.
• Contains one regular 12-pointed star polygon with vertex angle of 60°.
• There are three non-regular reflective tiles (including one kite) and one reflective pair.
• The tiling satisfies the interlace condition and has no finite interlace and two infinite interlaces with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 333 polygons.

1. Page 99, photo 55 (Qalawun, Cairo, Egypt. Right bottom window) of Jay Bonner. Islamic Geometric Patterns, Springer, 2016. ISBN 978144190216. [bonner] {Largest Islamic tile collection in print}

• Wade photo EGY 1109

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