Thread a thin wire or fishing line through the center of a wooden dowel.
Hang art pieces of equal weight on either side of the dowel, adjusting so that the dowel hangs relatively straight. This creates the basic structure of a mobile.
Apply more weight to one side than the other to create a unique design, keeping the dowel straight by adjusting the placement of the two art pieces.
Vary the placement of the wire or thread along the length of the dowel to accommodate art pieces of differing weights. Place the wire closer to the end that carries more weight.
Build upon this basic kinetic design by adding more dowels and or art pieces as weights until you are satisfied with the final outcome, making a mobile with variable levels and multiple art objects.
Decorate your weights and dowels in any manner of your choosing.