Stevens, Page 276

• The symmetry group of the tiling is 3*3 (p31m).
• All the internal angles of the constituent polygons are a multiple of 30°.
• 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 edge-to-edge.
• As drawn, contains about 140 polygons.

• Page 276, Figure 31.5 of Peter S Stevens. Handbook of regular patterns: an introduction to symmetry in two..., MIT Press, 1984. ISBN 026269088. [stevens] {Illustrations in black and white}

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