In what has to be the biggest boon to science since the invention of the gorilla detector, artist Mike Boon has scientifically classified The Muppets. His Periodic Table Of Muppets works simply as pop art, with each character reduced to a basic color scheme, a two-letter abbreviation, and a set of googly eyes. It's a credit to the iconic nature of the characters that most of them are immediately recognizable, and it's a credit to Boon that he went deeper than simply drawing the characters as squares. Each square is organized by the character's first appearance (the Sam And Friends characters, including Kermit, take up the hydrogen/helium top tier of the chart), and principal puppeteer.