Mustansiriya Madrasa, 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.
• The tiling satisfies the interlace condition and has two finite interlaces and no infinite interlace.
• The tiling is edge-to-edge.
• As drawn, contains about 110 polygons.

• Page 223 (Open brickwork, Mustansiriya Madrasa Baghdad) of Henri Stierlin. Islam: Early Architecture from Baghdad to Cordoba, Volume 1. Taschen, 1996. ISBN 382288561. [stierlin]

• Tiling with star polygons with 12 points whose vertex angle is 90°

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