Mustansiriya Madrasah, Baghdad

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 7.5°.
• Contains one regular octagon.
• Contains one regular 12-pointed star polygon with vertex angle of 90°.
• There are four non-regular reflective tiles (including one kite).
• The tiling satisfies the interlace condition and has two finite interlaces and no infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 149 polygons.

1. Page 407, Fig 333b (Palace of the Qala, Baghdad, Iraq) of Jay Bonner. Islamic Geometric Patterns, Springer, 2016. ISBN 978144190216. [bonner] {Largest Islamic tile collection in print}(1220AD, 616AH)
2. Page 223 (Mustansiriya Madrasah, Baghdad, Iraq. Open brickwork) of Henri Stierlin. Islam: Early Architecture from Baghdad to Cordoba, Volume 1. Taschen, 1996. ISBN 382288561. [stierlin] (1227-34AD, 623-31AH)
3. Internet photo (Tomb of Bayazid Bastami, Shahroud, Iran) of Not specific. Personal Communication, Information sent to the author, 21c. [pc]

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