more mathematical hats

The newest issue of knitty includes a pattern for a kleinbottle. It's probably better than mine, but since it was just published this week, I was totally first! I knit mine the same way she did hers, although I would probably knit it differently next time since the seam was kind of difficult - I had to pull the tight end where there is no tube out the hole, and that made the seam a bit tough to sew.