Echo in the Bowl

Empty? Not on my watch! I heard your calls bouncing around the quiet room, so I sprinted off the cushion and leaped straight down onto the polished wooden coffee table. Right in the middle sat an enormous, hollow ceramic bowl. I hopped onto the curved rim, cupped both gloved hands around my mouth, and let out a loud shout right into the bottom. The sound rattled inside and bounced back with a fun little boom. No place stays empty for long when there's an echo to test!