Uljay al-Yusufi

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 11.25°.
• Contains one regular octagon.
• Contains one regular 16-pointed star polygon with vertex angle of 45°.
• There are 7 non-regular reflective tiles (including one kite).
• The tiling satisfies the interlace condition and has no finite interlace and two infinite interlaces with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 294 polygons.

1. Photo by Peter Horree (Sultan Hasan, Cairo, Egypt) of Not specific. Personal Communication, Information sent to the author, 21c. [pc] (1356-61AD, 757-62AH)
2. Figure 121, Vol II (Uljay al-Yusufi, Cairo, Egypt) of Hasan `Abd-al-Wahhab. Tarikh al-masajid al-athariyah, Cairo, 2 vols in Arabic, 1946. [wahhab] {The History of ancient Egyptian mosques}(1373AD, 774AH)
3. Internet photo from mongabay.com (al-Azhar mosque, Cairo, Egypt. Ceiling) of Not specific. Personal Communication, Information sent to the author, 21c. [pc]

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