Bourgoin, Plate 170

• The symmetry group of the tiling is 4*2 (p4g).
• All the internal angles of the constituent polygons are a multiple of 3.21 (π/56)°.
• Contains one regular two-pointed star polygon with vertex angle of 77.14 (3π/7)°.
• Contains one regular octagon.
• Contains one regular 7-pointed star polygon with vertex angle of 77.14 (3π/7)°.
• 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 193 polygons.

1. Page 465, Fig. 407b (Mirjaniyya madrasah, Baghdad, Iraq) from [bonner] (1357AD, 758AH)
2. Archnet photoarchive ICR1365 (Amir Qijmas al-Ishaqi, Cairo, Egypt. Stone-carved panel, spring of iwan arch) from [pc] (1479-81AD, 884-6AH)
3. Abu al-Qasim, Mosul, Iraq from [pc]
4. Analysis here from [hankin2]
5. Page 379 from [abas]
6. Plate 170 from [bourgoin]

• Wade photo BOU 170

• Tilings not constructible by straightedge and compass

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