Hessemer, page 50 (top)

• The symmetry group of the tiling is 2*22 (cmm).
• All the internal angles of the constituent polygons are a multiple of 90°.
• Contains three squares.
• There are four non-regular reflective tiles and two reflective pairs.
• The tiling does not satisfy the two-colour condition.
• The tiling is not edge-to-edge.
• As drawn, contains about 274 polygons.

1. Page 50 (top) (Wooden openwork windows) of F M Hessemer. Historic Designs and Patterns in Color, Dover, a1840. ISBN 048626425. [hessemer] {This collection is unusual in giving the source for almost all the patterns.} Available on Internet.

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