Ring "Vibration"

The silver bead moves inside the ring. As the person walks, the silver vibrates — briefly and almost imperceptibly, but there is no doubt: it vibrates.

The brass surrounding the bead receives that vibration, changes it slightly, and sends it back as a warmer echo. The bead responds again, and so the vibration travels back and forth.

So, as long as the person is moving, the two metals are speaking.

Silver + brass