Roman mosaic, Silchester

The square is usually ornemented in some way, perhaps just an internal square.

• The symmetry group of the tiling is 442 (p4).
• All the internal angles of the constituent polygons are a multiple of 90°.
• There are no non-regular reflective pairs and one tile with no mirror image.
• The tiling satisfies the interlace condition and has no finite interlace and one infinite interlace with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 81 polygons.

1. The Metropolitan Museum of Art (Iraq. Wall decoration with geometric and floral decoration) from [pc] (700-99AD, 80-182AH)
2. Vol2, page 118 (Charbagh Madrasah, Isfahan, Iran) from [iran] (1122AD, 515AH)
3. Figure 32.5a, page 284 (No location, Stated as being from Egypt) from [stevens]
4. Page 18 (Used at Silchester, the Forum Baths at Herculaneum and Bignor) from [field1]
5. Page 54, pl 14 (Chedworth, UK) from [neal]
6. Pl 190 (a,d) (Saranda and Sousse) from [balmelle]
7. Vol2, page 358, Figure 331 (Raqqah, Syria. Blind window) from [sarre]

v54