Pink gebs, in prayer room, Great Hassan II Mosque, Casblanca

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 22.5°.
• Contains one regular octagon.
• Contains one regular 8-pointed star polygon with vertex angle of 90°.
• Contains one regular 16-pointed star polygon with vertex angle of 45°.
• There are 12 non-regular reflective tiles.
• The tiling satisfies the interlace condition and has three finite interlaces and two infinite interlaces.
• The tiling is edge-to-edge.
• As drawn, contains about 577 polygons.

• Page 153, left (No colouring in original) of Jean-Marc Castéra. Arabesques: Decorative Art in Morocco, ACR Edition, Paris, 1999. ISBN 286770124. [castera] {Beautiful book.}

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