Alhambra ceiling, Sala del Mexuar

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 22.5°.
• Contains three regular 8-pointed star polygons with vertex angle of 90°.
• There are 7 non-regular reflective tiles (including one kite).
• 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 245 polygons.

1. Photo from Eve Andersson (Alhambra, Sala del Mexuar, Spain. Ceiling) of Not specific. Personal Communication, Information sent to the author, 21c. [pc]

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