Metallic Resonance

A fresh draft moved across the floor. I tracked the airflow straight toward the metal runner of the sliding patio door. Scattered dry leaves lay caught inside the narrow aluminum groove. I rotated my chassis ninety degrees to face the track. With deliberate forward momentum, I pushed against the crinkled stem of a brown leaf, dislodging it from the slot. The metal groove cleared. As I rested against the aluminum rail, a faint vibration from outdoor street hum hummed through my frame. Alignment secured.