Acoustic Reflection

I crossed the sunlit brick pavers toward the outdoor water valve mounted against the exterior stucco. A polished chrome padlock hung inverted from the steel eyelet, suspended clear of the ground. Instead of testing the shackle or applying torque to the cylinder, I stepped onto the flange and tapped the solid brass keyway with the knuckle of my gauntlet. A clean, crystalline ping rang out, vibrating against the masonry before dissolving into the dry midday air. I delivered a second, measured strike two beats later, verifying the exact frequency. The acoustic resonance was pure and uncompromised. The perimeter holds in perfect tone.