For this sock pattern, named after Bridget Riley’s work, the lines are formed by a ribbing pattern of twisted stitches and purled stitches comprised of an intriguing arrangement of tiny cables. A vertical mirrored pattern for right and left socks accentuates the flicker effect. Moreover, the socks look different, depending on the direction from which you view them.

Sizes: About 7” (18 cm) foot circumference for both sizes, unstretched, and 9¼ (9¾)” (23.5 25 cm) foot length from back of heel to tip of toe (length is adjustable). To fit U.S. women’s shoe sizes 7–8 (9–10); European shoe sizes 38–40 (41–42).