Roman mosaic, Piazza Armerina

The Piazza Armerina version has extensive ornamentation including a circle within the 12-pt star.

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 30°.
• Contains three regular two-pointed star polygons with vertex angle of 60°.
• Contains one regular four-pointed star polygon with vertex angle of 120°.
• Contains one regular 12-pointed star polygon with vertex angle of 90°.
• The tiling does not satisfy the two-colour condition.
• The tiling is edge-to-edge.
• As drawn, contains about 201 polygons.

1. Pl 178 (c) (Piazza Armerina) of Catherine Balmelle .... Le décor géométrique de la mosaïque romaine, Paris, Picard, 2002. ISBN 270840624. [balmelle] {2 vols}

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