la caduta di un granello di sabbia dalla montagna può spostare il sole (clessidra)

The inevitable fall of the sand on the table, due to random vibrations in the environment, takes place in an imperceptible but constant way; next to the floor, a microphone is trying to record the noise of the fall of the sand on the ground that would activate the vibration of two woofer amplifiers. These support in a precarious manner two wooden boards that find support on ping pong balls.