"Po swirled upward from where it had been sitting, and floated over to the window. "When you go swimming and you put your head under the water," Po said, "and everything is strange and underwater-sounding, and strange and underwater-looking, you don't miss the air do you? You don't miss the above-water sounds and the above-water look. It's just different." "True." Liesl was quiet for a moment. Then she added, "But I bet you'd miss it if you were drowning. I bet you'd really miss the air then.""