Bourgoin, Plate 12

• The symmetry group of the tiling is *632 (p6m).
• All the internal angles of the constituent polygons are a multiple of 30°.
• Contains one regular three-pointed star polygon with vertex angle of 90°.
• Contains one regular 6-pointed star polygon with vertex angle of 30°.
• The tiling satisfies the interlace condition and has no finite interlace and one infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 65 polygons.

1. vol2, Plate 26 (Imam al-Shafi'i, Cairo, Egypt) from [creswell] (1211AD, 607AH)
2. Photo by Ayman Soliman (Qalawun, Cairo, Egypt) from [pc] (1284-5AD, 682-3AH)
3. Vol2, Figure 191 (al-Ashraf Barsbay, Cairo, Egypt. Base of minbar) from [wahhab] (1433AD, 836AH)
4. Page 331 (Sultan Hasan, Cairo, Egypt. mihrab) from [okane2] (1973AD, 1393AH)
5. Page 49 (Great Mosque, Damascus, Syria) from [broug]
6. Plate 12 from [bourgoin]
7. Plate 51 (Wall mosaics, 15th and 16th century) from [d-avennes]

• Wade photo BOU 012

v54