In April, she had a hyperbolic helicoid — a fantastically swirly helix, somewhat like a seashell ... Lace Lady). Knitting away for two months, Dr. Matsumoto encountered one stitch in the ...

But different knitting stitches tend to twist in different directions—think of a T-shirt curling at the bottom edge if the hem is cut off. The tension these stitches create can warp a two ...