Khayrbak, mosque

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 45°.
• Contains one square.
• Contains one regular 8-pointed star polygon with vertex angle of 45°.
• There are three non-regular reflective tiles.
• The tiling satisfies the interlace condition and has one finite interlace and one infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 241 polygons.

1. Page 60 (bottom) (Khayrbak, Cairo, Egypt. Stone ornaments, Mausoleum of the emir Khairbeg) of F M Hessemer. Historic Designs and Patterns in Color, Dover, a1840. ISBN 048626425. [hessemer] {This collection is unusual in giving the source for almost all the patterns.} Available on Internet.(1500AD, 905AH)
2. Photo EGY 0818 (Aqsunqur, Cairo, Egypt) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}

• Wade photo EGY 0818

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

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