Cairo, Door panel, wood and ivory

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 9°.
• Contains 7 regular pentagons.
• Contains two regular 8-pointed star polygons with vertex angle of 72°.
• There are 10 non-regular reflective tiles (including 3 kites).
• The tiling satisfies the interlace condition and has 12 finite interlaces and no infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 741 polygons.

1. Plate 49 (Cairo, Egypt. Door panel, wood and ivory) of J Collin. Étude pratique de la décoration polygonale arabe, Paris, 1911. ISBN . [collin] {}

• Wade photo EPC 049

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