As an aside, since I decided I really wanted to use this graphic, which I didn't design or create, I had to familiarize myself with a bit of copyright law. I ended up contacting the M.C. Escher estate, Cordon Art BV in Holland, and requesting to use the graphic in the article. Since we're a non-profit organization and have only a small print run of 700-1000 issues in ciculation, they honored my request to reproduce the graphic for free. In my copyright law researches, I also found out that Albert Einstein's likeness is owned by the Hebrew University in Jerusalem, who he willed it to as part of his estate. Other Einstein photos (such as the famous one with his tongue out) are owed by Caltech, and yes, you guessed it, Bill Gates. Hence no photos of Einstein here, but that's OK since they don't have anything to do with this article anyway.