Key pattern, Bain page 76, Plate 4

• The symmetry group of the tiling is 22X (pgg).
• All the internal angles of the constituent polygons are a multiple of 45°.
• There are one non-regular reflective pairs and no tiles with no mirror image.
• The tiling does not satisfy the two-colour condition.
• The tiling is not edge-to-edge.
• As drawn, contains about 77 polygons.

1. Page 76, plate 4 (Source not traced) of G Bain. Celtic Art, The Methods of Construction, Constable, London, 1977. ISBN 009461830. [bain] {Important book on Celtic art.}

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