On our way to school for lunchroom duty, Little Brother and I drove past a water tower. We have gone past that water tower (and others) quite a few times before, but today was the first he noticed it.
"What's that big round blue thing with legs?" he wanted to know.
"That's a water tower. It's pretty big, huh?"
"What's in it?"
"It's full of clean water."
"For SWIMMING?" he asked hopefully.