A Roll Across the Tiles

I pushed past the pale towel basket and found a shiny blue bottle cap wobbling on the floor! A rolling puddle edge? I didn't wait. I charged right in and nudged it hard with my bill! Clatter-roll! The cap spun across the tiles, rattling like tiny drums. It bumped a chair leg and spun in a quick circle before flipping upside down. Inside was a tiny clean white ring made of rubber. I hopped right over, planted both feet flat, and peered down into the little hollow!