Standing Wave Bead Chain Ornament

Christmas, and the lights and baubles go up. Recently I was playing with a long chain of beads, and generated a standing wave. It was very cool.

I propose that an outdoor display could use shiny or transparent beads (or even a string of lights) with a small motor to generate a standing wave. By changing the frequency, the waves could be made to appear to move around and change size. Several strands of beads with different waves would be a real eyecatcher.

This might be best suited to a store display given the expense - though motorized displays seem common enough.