Mosque of ibn Tulun, Cairo

• The symmetry group of the tiling is 4*2 (p4g).
• All the internal angles of the constituent polygons are a multiple of 45°.
• Contains two squares.
• There are two non-regular reflective tiles.
• The tiling satisfies the two-colour condition.
• The tiling is not edge-to-edge.
• As drawn, contains about 240 polygons.

1. Photo by David Wade: EGY 0206x (Ahmad Ibn Tulun, Cairo, Egypt) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}(876-9AD, 261-4AH)

• Wade photo EGY 0206x

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