The Alhambra, Sala de las dos Hermanas

• Gold star pattern(photo). Dynamic build of this pattern.
• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 22.5°.
• Contains two squares.
• Contains three regular 8-pointed star polygons with vertex angle of 90°.
• Contains one regular 16-pointed star polygon with vertex angle of 45°.
• There are 8 non-regular reflective tiles.
• The tiling satisfies the interlace condition and has two finite interlaces and no infinite interlace.
• The tiling is edge-to-edge.
• As drawn, contains about 581 polygons.

• Plate 3 (c) (West wall in The Hall of the Two Sisters) from [abas]
• Page 41 and 53 (The colours from photo but preserving symmetry) from [escher]
• Vol 2, page 398 (Marrakesh, Dar Beida, ceiling panel) from [paccard]
• Vol 2, page 288 (Detail of door, Royal Palace, Marrakesh) from [paccard]
• Vol 2, page 285 (Detail of door, Royal Palace, Fez) from [paccard]

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• Wade photo SPA 1209

• Escher's Alhambra tiling pattern

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