When you have your hangers ready, you can put them all together. This is the tricky part. How do you balance the hangers? I suggest that you build from the bottom up, and balance as you go along. You tie the bottom pieces making sure the knots are movable. Finally you can balance the knots and glue them in place. Try to hang your mobile in a place where it will catch sunlight. CDs will show a rainbow of colors in a well lit area.