Citadel at Aleppo, Syria
data21/P43
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Geometry
- The symmetry group of the tiling is *442 (p4m).
- All the internal angles of the constituent polygons are a multiple of 45°.
- Contains one regular two-pointed star polygon with vertex angle of 45°.
- Contains two regular octagons.
- There is one non-regular reflective tile.
- The tiling satisfies the two-colour condition.
- The tiling is edge-to-edge.
- As drawn, contains about 117 polygons.
References
Publications referenced:
- Figure 5.6.2 on page 264 of B Grünbaum and G C Shephard. Tilings and Patterns, W H Freeman, 1987. ISBN 071671193. [gands] {Most important work in this area.}
- Page 37 (Citadel, Aleppo, Syria) of Robert Field. Geometric Patterns from Islamic Art and Architecture, Tarquin Publications, 1998. ISBN 189961822. [field4]
- Page 43 of David Wade. Pattern in Islamic Art, Studio Vista, 1976. ISBN 028970719. [wade] {Some beautiful coloured patterns, but source not given.}
Photographs
v44