San Giovanni Laterano, Rome

• The symmetry group of the tiling is *442 (p4m).
• All the internal angles of the constituent polygons are a multiple of 30°.
• Contains 40 equilateral triangles.
• Contains two squares.
• There are two non-regular reflective tiles.
• The tiling satisfies the two-colour condition.
• The tiling is not edge-to-edge.
• As drawn, contains about 434 polygons.

1. Plate XXX(32) (Byzantine ornament, San Giovanni Laterano, Rome, Italy) of Owen Jones. The Grammar of Ornament, Dover, 1856. ISBN 048625463. [jones] {Excellent book with 100 colour plates, with many containing several tiling patterns.} Fuller version available on Internet.

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