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Opposed windwheels, Residence, Chengtu, Szechwan, 1875 AD. Also the same as Figure K 10a. Also the same as Figure I.10.2 in G & S.

This pattern is a member of an interesting class of mathematical patterns. PP Class 72, [p4g,c4,d2], IH Class 73.

Statistics on this tiling:

- Tiling has symmetry
*p4g*. - Tiling has 4 polygons (with 24 edges) of which 1 are specified as copies of others.
- 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 207 polygons.