Starting with a pair of the lark's head knots, create a square knot, bring the far left strand of yarn over the two middle strands and under the far right one. Bring the far right strand of yarn under the middle two and over the far left, then pull tight.
Then bring the strand on the far left under the middle two and over the one on the far right. Finish by bringing the strand on the far right over the middle two and under the left one. Pull tight.
Repeat with the next two sets of lark's head knots and keep working around the top of the cage until you have completed a full row of square knots. Continue making square knots down the cage, adjusting the tightness of the knot as the pendant widens.
Once finished, knot at the bottom of the frame and trim excess cords.