Here’s a neat sound sculpture made by The Books. The spoons are animated by playing sounds on a speaker mounted behind them. This works because sound waves are basically traveling pressure differences. When the sound wave hits the spoon with more pressure than the atmospheric pressure of the room on the other side, the spoon gets sucked outward. You can try this by yourself if you have a subwoofer with a small opening- just stick a piece of paper over it.
It seems like it would be an interesting challenge to compose music for, because the sound and spoon movement are tightly coupled. I wonder if you could use this principle ot create a feedback-based drum machine?