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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.