Quote
Together, Yackel and Belcastro have co-edited a new book "Making Mathematics with Needlework: Ten Papers and Ten Projects." In it, they use the knitting of a baby’s pants to show how, in certain types of mathematics, an octagon can be folded into a two-holed donut. Using their math, if one crocheted a stop sign, it could be folded into a pair of pants.
FWIW, I think it's interesting to watch Constance knit socks, going around the bend to make a perfect heel. Even that seems, to me, a non-trivial exercise.