And the first pair was easy. The first sock didn't pool at all in the foot, but by the time I got to the ribbing, it was doing the striping within the pools thing that made me hide the yarn away in the first place. I knit the second pair from the outside of the skein, and the foot pooled.
The yarn is Knitpicks Dancing, a sproingy blend of cotton, wool, nylon, and other. I love the feel of this yarn and stashed every color before they discontinued it. Sock yarn used to be cheaper. Knit on size 0 Clover bamboo dpns, 72 stitches, toe-up, short row heel...
Seriously -- how does yarn do this? Perfect single row striping within the pool. I could never in a million years do that on purpose.
I'm working on three more pairs, in yarn line that I was warned would pool, that has pooled when I've knitted with it before, and is it pooling? No such luck!