Roman mosaic, Rome

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 90°.
• Contains four squares.
• There is one non-regular reflective tile.
• The tiling satisfies the interlace condition and has one finite interlace and one infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 189 polygons.

1. Page 17 (Church of Saint Sebastian in Rome, Italy. Mosaic, colouring not known) of Robert Field. Geometric Patterns from Roman Mosaics, Tarquin Publications, 1996. ISBN 090621263. [field1] {Gives sources of several interesting Roman patterns.}
2. Pl 118 (a) (Rome) of Catherine Balmelle .... Le décor géométrique de la mosaïque romaine, Paris, Picard, 2002. ISBN 270840624. [balmelle] {2 vols}

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