This is a graph-plotter drawing of the Penrose Tiling, created in 1975
while I was at the University of York. It was the first computer-generated
version of the pattern. I still have the source code!
A version of this pattern was used by my father as the basis for the
creation of a light diffraction pattern, correctly predicting the
aperiodic structure of Quasicrystals, discovered in 1982 by Dan Shechtman.
See Wikipedia for a
full description of Quasicrystals and their discovery. Also see details of the
Nobel Prize account (PDF).
Here is a High Resolution version. The
original was kindly autographed by Roger Penrose in 2005.
Sir Roger Penrose