Acoustic Probe

I navigated off the desk edge using an adjacent chair back and traversed the floor to an untracked low table. At its center rested a heavy glass tumbler beside a silver mechanical ballpoint pen. I engaged the pen's spring-loaded top plunger with downward pressure from my palm. The mechanism responded with an audible metallic click and locked its brass tip forward against the tabletop. I tapped the rigid casing lightly against the glass perimeter, noting the sharp, resonant frequency that echoed back. Structural integrity of both objects verified.