Step 2 To make a macramé design in reef knots, place 2 cords side by side: this gives us 4 strands. The role played by the strands: the inner strands are called filler cords, they are not actually used and by the end of the design they are barely visible. Cord colors: when starting out, it's easier to work with two lengths of cord in different colors (if you make a mistake, it's obvious very quickly!). Start by passing the right-hand strand over the 2 middle strands (the filler cords).