Two Polygons, PP Class 39, [p3lm,c3,c1], IH Class 30.

• The symmetry group of the tiling is 3*3 (p31m).
• All the internal angles of the constituent polygons are a multiple of 60°.
• Contains two equilateral triangles.
• 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 62 polygons.

1. Plate 19 (Western tomb tower, Kharraqan, Iran. This is from an arch panel on the later tower) of Sonia P, Seherr-Thoss. Design and color in Islamic architecture; Afghanistan, Iran, Turkey, Smithsonian Institution, 1968. [seherr] {312p}(1093AD, 485AH)
2. PP Class 39, [p3lm,c3,c1], IH Class 30 of S J Dawes and B A Wichmann. A New Class of Tilings with Two Prototiles, Visual Mathematics, Vol 3, No 4., 2001. [dawes] {Revises CD/booklet.} Available on Internet.

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