Roman mosaic, Tivoli and Mactar

• The symmetry group of the tiling is 442 (p4).
• All the internal angles of the constituent polygons are a multiple of 90°.
• Contains one square.
• There is one non-regular reflective tile.
• The tiling does not satisfy the two-colour condition.
• The tiling is not edge-to-edge.
• The tiling satisfies the two-polygon condition.
• As drawn, contains about 194 polygons.

1. PP Class 59, [p4,c4,c1], IH Class 28 from [dawes]
2. Page 16 (Salisbury Cathedral, UK. Window grill) from [field1]
3. Page 35 from [field2]
4. Pl 141 (a,b) from [balmelle]

Photo?

v54