Mosque of ibn Tulun

• The symmetry group of the tiling is 632 (p6).
• All the internal angles of the constituent polygons are a multiple of 60°.
• Contains one equilateral triangle.
• Contains one regular two-pointed star polygon with vertex angle of 60°.
• Contains one regular hexagon.
• The tiling satisfies the two-colour condition.
• The tiling is edge-to-edge.
• As drawn, contains about 179 polygons.

1. Photo by David Wade: EGY 0511 (Ahmad Ibn Tulun, Cairo, Egypt) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}(876-9AD, 261-4AH)

• Wade photo EGY 0511

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