Yusif ibn Kuseyir, Nakhchivan

• The symmetry group of the tiling is 442 (p4).
• All the internal angles of the constituent polygons are a multiple of 90°.
• Contains one square.
• There are no non-regular reflective pairs and one tile with no mirror image.
• The tiling does not satisfy the two-colour condition.
• The tiling is not edge-to-edge.
• As drawn, contains about 117 polygons.

1. Fig 3 (a) (Yusif ibn Kuseyir, Nakhchivan, Azerbaijan, Central Asia) of Peter Cromwell. Islamic geometric ornament ... in Azerbaijan, To be published, 2018. [cromwell4] {}(1148AD, 542AH)

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