Sir Roger Penrose	Want to know who Sir Roger Penrose is... Look here.
Java applet	Shu-Xiang Zeng got a "Dr. Matrix Award" for his Java-applet by his challenge.
Pentaplex Ltd	Home of Seriously Perplexing Products. They sell puzzles based on the Penrose tilings.
Tessellations	is the company that makes Puzzellations and Perpetual Patterns puzzles, plus posters, prints, and kaleidoscopes based on original graphic designs inspired in part by the Dutch graphic artist M.C. Escher, but also by mathematicians such as Roger Penrose and Benoit Mandelbrot. All of our tiling designs are created by the company's founder, Dr. Robert Fathauer, who combines interests in art and math to create mind-challenging products.

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