Imam Yahya mosque

• The symmetry group of the tiling is *2222 (pmm).
• All the internal angles of the constituent polygons are a multiple of 45°.
• Contains one square.
• Contains one regular 8-pointed star polygon with vertex angle of 90°.
• There are two non-regular reflective tiles.
• The tiling satisfies the interlace condition and has no finite interlace and one infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 255 polygons.

1. Page 231 (Imam Yahya mosque, Mosul, Iraq. Above the door) of Javad Shafai. On decoration in Persian architecture and wood carving, Tehran, 1977. [shafai] {In Persian}(1239AD, 636AH)
2. AL.8322:1 (Iran. Sketch by Mirza Akbar) of V&A collections website. Website: collections.vam.ac.uk, UK, 2015. [vami] {Website}
3. Sheet 45a, marked II of Mirza Akber. Persian decoration of Mirza Akber, Victoria and Albert Museum, NAL, 1898. [akber] {Pressmark VA.1898.0001}

• V&A record Drawing

• Tiling whose tile angles are a multiple of 45° and whose lengths are p+q*sqrt(2).

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