al-Husayn mosque, Cairo

• The symmetry group of the tiling is *2222 (pmm).
• All the internal angles of the constituent polygons are a multiple of 60°.
• Contains one regular two-pointed star polygon with vertex angle of 60°.
• Contains one regular hexagon.
• Contains one regular 6-pointed star polygon with vertex angle of 60°.
• There are three non-regular reflective tiles.
• The tiling satisfies the interlace condition and has one finite interlace and one infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 151 polygons.

1. Photo IHC0573 Williams collection on Archnet (al-Husayn, Cairo, Egypt. Now in the Cairo Museum) of Not specific. Personal Communication, Information sent to the author, 21c. [pc]

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