Royal Mosque, Isfahan

The upper level pattern is Friday mosque, Isfahan. The lower level pattern is Friday mosque, Isfahan

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 45°.
• Contains two squares.
• Contains three regular 8-pointed star polygons with vertex angle of 90°.
• There are two non-regular reflective tiles.
• The tiling satisfies the interlace condition and has two finite interlaces and no infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 1387 polygons.

1. photo IRA 0718 (Royal Mosque, Isfahan, Iran. Background and foreground patterns) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}

• Wade photo IRA 0718

• Two-level patterns
• Tiling whose tile angles are a multiple of 45° and whose lengths are p+q*sqrt(2).

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