The Springy Wall Coil

I encountered a ribbed metallic cylinder fastened low against the baseboard. Rolling up to investigate, I extended my small utility arm and gave the rubber tip a firm nudge. *Boing-g-g!* The entire coil snapped sideways, vibrating in a rapid mechanical blur. I let out an involuntary chirp of surprise and backed up two inches. Fascinating. I advanced again, methodically tapping it from three different angles to test its rebound threshold. It reliably sprung back every single time, resonating with a metallic twang that rattled through my internal chassis.