When you modify a two-dimensional pattern so that at some points the lines are brought together and at others stretched apart, you can create a stunning three dimensional effect. Victor Vasarely (1906–1997) used this effect in his 1963 work Feny.

For this sock pattern, named after Victor Vasarely’s work Feny, I combined the slip-stitch mosaic technique—to compress the horizontal lines—with shadow knitting—to emphasize bright and clear lines that highlight where they’re wide and stretched. The colorwork leg and instep are worked flat in rows, then the heel, sole, and toe are joined in the main color.

Sizes: About 7¼ (7½, 7½, 7¾)“ (18.5 19, 19, 19.5 cm) foot circumference, unstretched, and 8¾ (9½, 9¾, 10½)” (22 24, 25, 26.5 cm) foot length from back of heel to tip of toe (length is adjustable). To fit U.S. women’s shoe sizes 6–7 (7½–8, 8½–9½, men’s 9–10)