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Type: classic tessellation (implies: abstract tessellation, abstract, geometric, pattern, abstract periodic tessellation, non-recursive periodic tessellation, periodic tessellation, tessellation)
Author: Michał Kosmulski
In albums: Tessellations with Decorated Edges
The molecule is 6×6 grid units, so normally 3×3 molecules would require an 18×18 grid. Since folding power-of-two grids is much more convenient than others, I skipped one grid unit at the edge from all but the central molecule which allowed me to use a 16×16 grid and resulted in a pinwheel-like shape for the finished tess instead of the conventional square one would normally end up with.