Today is the right day to have a one-track mind! August Ferdinand Möbius was born on this date in 1790. He is famous for studying the properties of the "Möbius strip," the amazing three-dimensional surface that has only one side. Photobucket has some wonderful images of Möbius strip art. Although the paisleys on my tie are not Möbius figures, they are sufficiently loopy to be appropriate for this anniversary.