Think of each working cord numbered 1 to 4, then follow the step by step instructions.
You have now made a half square knot! Repeat these steps backwards starting with cord 4 and you will have a full square knot.
HALF SQUARE KNOT
1. You need two folded cords secured with a lark’s head knot onto a length of string (stuck to a table with masking tape) or some sort of stick like the drift wood I found for these images! You now have four strings to work with.
2. Move working cord 1 over cords 2 and 3, heading right. Pass it under the working cord 4.
3. Move working cord 4 to the left, passing it under the two middle cords up through the loop and over working cord 1.
4. Pull on both working cords to tighten the knot, while holding the middle cords steady.
5. Now repeat steps 2-3 backwards starting with cord 4. Move working cord 4 to the left, passing it over the middle cords and under working cord 1.
6. Move working cord 1 to the right, passing under the middle cords though the loop and over cord 4.
7 and 8. Tighten the square knot by pulling on the working cords, while holding the middle cords steady.