Round Tower, Maragha

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of .5°.
• Contains one regular octagon.
• Contains one regular 8-pointed star polygon with vertex angle of 45°.
• There are three non-regular reflective tiles and one reflective pair.
• The tiling satisfies the interlace condition and has one finite interlace and no infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 223 polygons.

1. Fig 4 (a) (Round Tower, Maragha, Iran) of Peter Cromwell. Islamic geometric ornament ... in Azerbaijan, To be published, 2018. [cromwell4] {}(1168-9AD, 563-4AH)

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