Alhambra, Sala de las Dos Hermanas

The repeat of the graphic is taken from the middle part of the ceiling of the long transverse corridor across the entrance into the Sala de las Dos Hermanas, between it and the north gallery of the Patio de los Leones.

• The symmetry group of the tiling is *2222 (pmm).
• All the internal angles of the constituent polygons are a multiple of 22.5°.
• Contains two squares.
• Contains one regular octagon.
• Contains one regular four-pointed star polygon with vertex angle of 45°.
• Contains one regular 8-pointed star polygon with vertex angle of 45°.
• There are 11 non-regular reflective tiles (including one kite).
• The tiling satisfies the interlace condition and has two finite interlaces and two infinite interlaces with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 328 polygons.

1. Photo by David Wade: SPA 0536x (Alhambra, Sala de las Dos Hermanas, Spain) of David Wade. Website: patterninislamicart.com, UK, 2015. [wadei] {Website}
2. Plate XCb of Basilio Pavón Maldonado. El arte hispanomusulman en su decoración geométrica, Madrid : Ministerio de Asuntos Exteriores, Instituto Hispano-Arabe de Cultura, 1975. ISBN 846006881. [pavon] {461p, 140 plates}

• Wade photo SPA 0536x

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