Mosque of Sultan Hassan

• The symmetry group of the tiling is *2222 (pmm).
• All the internal angles of the constituent polygons are a multiple of 22.5°.
• Contains one regular octagon.
• There are three non-regular reflective tiles and one reflective pair.
• 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 128 polygons.

1. Photo by David Wade: EGY 0717 (Sultan Hasan, Cairo, Egypt) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}(1356AD, 757AH)

• Wade photo EGY 0717

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