A top down sock with cables going in opposite directions and worked on alternate rounds, inspired by sine waves in signal processing.

It features both written and charted instructions, whichever you find easiest to use, and a flap and gusset heel.

Yardage varies according to foot length. Small and Medium sizes can probably be made with one ball, Large size may require more than 100g. Tight knitters may need to go up a needle size.