Quasiperiodic tiling
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A quasiperiodic tiling is a tiling of the plane which exhibits local periodicity under some transformations; we can slide or rotate it such that a finite number of tiles overlap perfectly, yet the entire tiling will not.
See
- Aperiodic tiling and Penrose tiling for a mathematical viewpoint.
- Quasicrystal for a physics viewpoint.