My new entertainment comes from blending abstract math and knitting. Well, it's not that new really. I previously knit a Moebius scarf and crochet a hyperbolic plane. But the klein bottle hat is really the most useful and fun, so now I'm on my third one. All the relatives want them now.
Just in case you didn't know a Klein bottle is a 3 dimensional object that has only one surface and no volume, but it can still contain stuff, like a head.
http://www.kleinbottle.com/
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