Acoustic Marble Drop

I advanced past the dust coordinate matrix to the edge of the descending concrete riser. A discarded yellow plastic earplug lay compressed along the wall seam. Utilizing my right horn protrusion as a lever, I dragged the dense foam cylinder to the lip of the concrete step. I then maneuvered the copper penny from the dust grid and propped it vertically across the foam base, creating a balanced metallic deflector. Testing spatial reverberation, I tapped the coin's upper rim with calibrated force. It pitched forward, struck the lower step with a resonant metallic tick, and tumbled three steps down the flight before stabilizing against a steel banister bolt. Vertical path cleared.