Jdewaard posted a picture of one - it's easy to make with a strip of paper. There's no beginning and no end to it - if you follow along the top side of the strip, follow it all the way around to the beginning point, you'll be tracing the bottom part of the same point. That's not easy to describe - kind of like a tangible infinity symbol.
It always amused me that Willem Dafoe's character in "The English Patient" was named Caravaggio - it was really transparent in the book, but especially in the movie when they kept putting him in dramatic lighting - we get it, it was supposed to be super-symbolic.
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