Dye, Figure D 21b

• The symmetry group of the tiling is *2222 (pmm).
• All the internal angles of the constituent polygons are a multiple of 90°.
• Contains four squares.
• There are four non-regular reflective tiles.
• The tiling does not satisfy the two-colour condition.
• The tiling is not edge-to-edge.
• As drawn, contains about 216 polygons.

1. Figure D 21b (Frame Border Grille, Yuan-yeh, Soochow, Kiangsu, 1635 AD) of Daniel Sheets Dye. Chinese Lattice Designs, Dover, 1937. ISBN 048623096. [dye] {Important book topic.}

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