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.
Also, here is the original paper describing the Penrose Impossible Triangle and the Impossible Staircase.