Local Rules and Global Order, or Aperiodic Tilings


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Communications in Mathematical Physics

Aperiodic tiling

The Penrose tiles are a pair of shapes that tile the plane only aperiodically when the markings are constrained to match at borders. These two tiles, illustrated above, are called the "kite" and "dart," respectively. In strict Penrose tiling, the tiles must be placed in such a way that the colored markings agree; in particular, the two tiles may not be combined into a rhombus Hurd. Two additional types of Penrose tiles known as the rhombs of which there are two varieties: fat and skinny and the pentacles or which there are six type are sometimes also defined that have slightly more complicated matching conditions McClure In , Penrose sued the Kimberly Clark Corporation over their quilted toilet paper, which allegedly resembles a Penrose aperiodic tiling Mirsky The suit was apparently settled out of court.

To see how the plane may be tiled aperiodically using the kite and dart, divide the kite into acute and obtuse tiles, shown above Hurd. Now define "deflation" and "inflation" operations.


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The deflation operator takes an acute triangle to the union of two acute triangles and one obtuse , and the obtuse triangle goes to an acute and an obtuse triangle. These operations are illustrated above. Note that the operators do not respect tile boundaries, but do respect half-tiles.

When applied to a collection of tiles, the deflation operator leads to a more refined collection. The operators do not respect tile boundaries, but do respect the half tiles defined above.


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There are two ways to obtain aperiodic tilings with 5-fold symmetry about a single point. They are known as the "star" and "sun" configurations, and are shown above Hurd. Higher order versions can then be obtained by deflation. For example, the illustrations above depict the third-order deflations Hurd. John Conway has asked if Penrose tilings are three colorable in such a way that adjacent tiles receive different colors. Sibley and Wagon proved that tilings by rhombs are three-colorable , and Babilon proved that tilings by kites and darts are three-colorable. McClure then found an algorithm that appears to three-color tilings by kites and darts, rhombs, and pentacles.

Babilon, R. Gardner, M. Matrix, reissue ed. New York: W.

Aperiodic tiling

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Local Rules and Global Order, or Aperiodic Tilings Local Rules and Global Order, or Aperiodic Tilings
Local Rules and Global Order, or Aperiodic Tilings Local Rules and Global Order, or Aperiodic Tilings
Local Rules and Global Order, or Aperiodic Tilings Local Rules and Global Order, or Aperiodic Tilings
Local Rules and Global Order, or Aperiodic Tilings Local Rules and Global Order, or Aperiodic Tilings

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