What better to knit a math professor than a four-dimensional object that can be worn? Unfortunately, this one turned out a bit small to be a grown-up sized hat. I knit this kleinbottle from the beginning of the tube part, and then made a bulb with a hole. I attached the narrow end of the bulb to the end of the tube through the hole. If I were to do it again, I'd use thinner yarn (I used Jo-Ann Sensations brand Life yarn) and make sure that the bulb part was long enough to cover the ears when doubled over.
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