In a comment in the last post, Devil Kitty says that she likes the way the spirals look like hexagons on the edges, but are more round in the middle. Me too! And not to get too scientific, but in Norah Gaughan's book "Knitting Nature," she talks about how bubbles are round when they are in single form, but that they form straight lines to make hexagons (or is it pentagons?) when they cluster. I guess the spirals are just acting like bubbles.
That's such a cool book--blending knitting with science is unexpected, but interesting. I may not remember the exact details, but I end up knowing the gist of things. Check it out!