Friday mosque, Isfahan

• The symmetry group of the tiling is *2222 (pmm).
• All the internal angles of the constituent polygons are a multiple of 60°.
• Contains five regular two-pointed star polygons with vertex angle of 60°.
• Contains one regular 6-pointed star polygon with vertex angle of 60°.
• The tiling does not satisfy the two-colour condition.
• The tiling is edge-to-edge.
• As drawn, contains about 201 polygons.

1. Page 213 (Friday mosque, Isfahan, Iran) of Javad Shafai. On decoration in Persian architecture and wood carving, Tehran, 1977. [shafai] {In Persian}

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