
 IMA Update, Fall 2004 
  The visual aspect of Penrose's creativity is wellknown: the Penrose staircase, which he invented in collaboration with his father, is a fascinating perceptual puzzle, while the Penrose tiling is a mesmeric solution to a longstanding geometric problem. 
  Penrose's sketches gave form to mathematical and physical concepts, from the five elements and their corresponding Platonic solids, to light cones and spin states, and in doing so allowed the audience to glimpse a great theorist's vision of the mathematical world. 
  Professor Sir Roger Penrose, FRS OM, is Emeritus Rouse Ball Professor of the University of Oxford. 
 www.ima.umn.edu /newsletters/updates/fall04/publect.shtml (378 words) 
