Bourgoin, Plate 116, version A

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 1.87 (π/96)°.
• Contains one regular 8-pointed star polygon with vertex angle of 71.25°.
• Contains one regular 12-pointed star polygon with vertex angle of 71.25°.
• There are 16 non-regular reflective tiles (including 5 kites).
• The tiling satisfies the interlace condition and has three finite interlaces and no infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 561 polygons.

1. Thesaurus Islamicus M223P0027 (Qaytbay, Cairo, Egypt. Panels on east facade, not exact match) of Not specific. Personal Communication, Information sent to the author, 21c. [pc] (1474AD, 878AH)
2. Page 291 of S J Abas and A S Salman. Symmetries of Islamic Geometrical Patterns, World Scientific, 1995. ISBN 981021704. [abas] {Very many patterns in black and white, no sources given.}
3. Plate 116 (Divergent 8-rosettes) of J Bourgoin. Arabic Geometrical Pattern and Design, Dover, 1879. ISBN 048622924. [bourgoin] {Classical book of around 200 hand-produced patterns, in back and white.} Fuller version available on Internet.

• Wade photo BOU 116

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