The trouble with five
by Craig Kaplan
Figure 18: A patch of tiling produced by Penrose's substitution rules.
© 1997-2009, Millennium Mathematics Project, University
of Cambridge.
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Permission is granted to print and copy this page on paper for non-commercial use. For other uses, including electronic redistribution, please contact us.
Seven things everyone wants to know about the universe
Issue 45
December 2007
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