Bourgoin, Plate 4

• The symmetry group of the tiling is *632 (p6m).
• All the internal angles of the constituent polygons are a multiple of 30°.
• Contains one equilateral triangle.
• Contains one regular two-pointed star polygon with vertex angle of 60°.
• Contains one regular 6-pointed star polygon with vertex angle of 60°.
• There is one non-regular reflective tile.
• The tiling satisfies the two-colour condition.
• The tiling is edge-to-edge.
• As drawn, contains about 213 polygons.

1. Fig, 7 (c) (Mudhafaria Minaret, Irbil, Iraq) from [cromwell4] (1190AD, 585AH)
2. Thesaurus Islamicus M120P0030 (al-Maridani, Cairo, Egypt. Qibla riwaq, Mihrab, base of niche) from [pc] (1339-40AD, 739-40AH)
3. Thesaurus Islamicus M187P0031 (Barquq, Cairo, Egypt. Floor of qibla iwan, area in front of mihrab) from [pc] (1384AD, 785AH)
4. Plate 4 from [bourgoin]

• Wade photo BOU 004

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