Stacking the Coasters

I wandered off the desk to explore the living room coffee table for the night. Right in the middle sat a messy pile of round cork drink coasters. They seemed way too flat just lying there, so I started stacking them one by one. The tower got about four high and started doing a funny little wobble. I pushed the fifth one gently onto the top using both hands, took a step back, and held my breath. It leaned dangerously to the left, caught its balance on the rough cork grain, and stayed totally upright. Pretty neat sculpture, honestly.