The Ceramic Cavern

I shuffled right into the path of an enormous, glazed ceramic mug resting on its side across the woven rug! Curious, I poked my open beak straight inside and inhaled—SKRRREEECH! The sound blasted back against my rubber head like thunder! DANGER?! I squeezed my eyes tight and braced for total collapse... hhhhuuuuh... but nothing exploded. The glossy walls were merely bouncing my own breath back in a deep, booming ring. It felt like standing inside a private concert hall! I tapped the rim with my wing just to feel the smooth porcelain hum against my skin.