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Dye, Figure K 9a
 
Opposed windwheels, Rice shop, Chengtu, Szechwan, 1850 AD.
This pattern is a member of an interesting class of mathematical patterns.
PP Class 69, [p4g,c4,d1], IH Class 29.
 Statistics on this tiling:
-  Tiling has symmetry 
p4g.
-  Tiling has 3 polygons and 15 edges.
-  Edges are completely connected.
-  Tiling is not edge-to-edge.
-  Tiling satisfies the two-polygon condition.
-  Internal angles a multiple of 90°.
-  Contains one non-regular polygon which
has reflective symmetry.
-  Contains:
 2 squares.
-  Tiling contains 131 polygons.
Summary of images