Hessemer, page 53 (top left)

• The symmetry group of the tiling is ** (pm).
• All the internal angles of the constituent polygons are a multiple of 90°.
• There are two non-regular reflective tiles.
• The tiling satisfies the interlace condition and has no finite interlace and two infinite interlaces with straight cross-overs.
• The tiling is edge-to-edge.
• As drawn, contains about 45 polygons.

1. Page 53 (top left) (Glazed-brick pattern from the portals of an unspecified mosque in Alexandria) 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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