Mosque of Sultan Hassan

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 22.5°.
• Contains one square.
• Contains one regular octagon.
• There are three non-regular reflective tiles and one reflective pair.
• The tiling does not satisfy the two-colour condition.
• The tiling is not edge-to-edge.
• As drawn, contains about 280 polygons.

1. Photo by David Wade: EGY 0608 (Sultan Hasan, Cairo, Egypt) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}

• Wade photo EGY 0608

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