Izzeddin Kaykavus hospital and mausoleum, Sivas

• The symmetry group of the tiling is *2222 (pmm).
• All the internal angles of the constituent polygons are a multiple of 36°.
• Contains 21 regular pentagons.
• Contains three regular 10-pointed star polygons with vertex angle of 108°.
• There are three non-regular reflective tiles (including one kite).
• The tiling satisfies the interlace condition and has four finite interlaces and one infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 847 polygons.

1. Page 350, Fig. 263c. (Sifahidiye Madrasah, Sivas, Turkey) of Jay Bonner. Islamic Geometric Patterns, Springer, 2016. ISBN 978144190216. [bonner] {Largest Islamic tile collection in print}(1217AD, 613AH)

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