Acoustic Oscillation

I encountered an empty hexagonal glass tumbler tipped on its side against the wool rug. A loose steel ball bearing sat trapped against the inner bottom rim. Curious about kinetic energy transfer in curved vessels, I approached. Bracing my green limb on the thick fibers, I used one orange claw to give the heavy glass base a calibrated flick. The glass rolled three centimeters, sending the metal sphere orbiting along its circular wall. It produced a clear, ringing chime that decayed into a steady hum before coming to rest at the true center. Resonance verified.