The geometry is a polyomino, formed with 9 congruent squares. This window lattice is used for the garden and for room dividers. This is also suitable for floor tiles and outdoor pavings. I have seen patterns like this on the tread of automobile tires and on the bottom of shoes. This is also a good design for manhole covers.
"Polyominoes" by Soloman W. Golomb, Princeton University Press, 1994, 184 pages.
"Symmetries of Culture," by Dorothy K. Washburn and Donald W. Crowe, University
of Washington Press, 1988, 300 pages.
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