Gunbad-i Surkh, Maragha

• The symmetry group of the tiling is *632 (p6m).
• All the internal angles of the constituent polygons are a multiple of 15°.
• Contains one regular hexagon.
• Contains one regular 12-pointed star polygon with vertex angle of 120°.
• There are 6 non-regular reflective tiles (including 2 kites) and one reflective pair.
• The tiling satisfies the interlace condition and has three finite interlaces and no infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 513 polygons.

1. Fig 2 (b) (Gunbad-i Surkh, Maragha, Azerbaijan, Central Asia) of Peter Cromwell. Islamic geometric ornament ... in Azerbaijan, To be published, 2018. [cromwell4] {}(1148AD, 542AH)

• Tilings with coloured interlacing

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