The principle iwan of the Friday mosque in Isfahan

• The symmetry group of the tiling is 4*2 (p4g).
• Contains two regular octagons.
• Contains one regular 10-pointed star polygon with vertex angle of 85.5°.
• There are three non-regular reflective tiles and one reflective pair.
• The tiling does not satisfy the two-colour condition.
• The tiling is not edge-to-edge.
• As drawn, contains about 131 polygons.

1. Page 135, bottom (Friday mosque, Isfahan, Iran) of Degeorge, G ́erard and Porter. The Art of the Islamic Tile, Paris, 2002. ISBN 208010876. [degeorge2] {}
2. Photo by David Wade: IRA 0719 (Friday mosque, Isfahan, Iran) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}

• Wade photo IRA 0719

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