Field, Churches, page 41 (bottom left)

• The symmetry group of the tiling is ** (pm).
• All the internal angles of the constituent polygons are a multiple of 60°.
• Contains 14 equilateral triangles.
• The tiling satisfies the two-colour condition.
• The tiling is not edge-to-edge.
• As drawn, contains about 209 polygons.

• Page 41 (bottom left), diagram (Colouring not known, Cosmatesque Floors, Santa Cosedin, Rome) of Robert Field. Geometric Patterns from Churches and Cathedrals, Tarquin Publications, 1996. ISBN 189961813. [field2]
• Figure 2-95 (Interior of the vestibule of the Casino di Pio IV, Vatican City) of Paloma Pajares-Ayuela. Cosmatesque ornament: flat polychrome geometric patterns..., Thames and Hudson, 2002. ISBN 050051075. [pajares] {London}

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