A maddycraft project pattern that combines knitting and knotting. With a few twists and turns, easy-to-knit I-Cord becomes a Celtic Heart Knot. The decorative motif of interlacing patterns is visible throughout history from ancient cultures to modern times. These designs are most often associated with the national identity of the Celtic populations of Ireland, Scotland, and Wales. Any weight of yarn in any fiber may be used to complete this project. However, a smooth-textured yarn allows for the best definition of the knotting and will lend an attractive appearance to the cord. This maddycraft pattern includes written instructions with a photo tutorial.