"...If there's a noise in the woods, and there's nobody around to hear it, is it really a noise?" "Of course it is," she replied calmly. "How did you reach that conclusion?" Beldin demanded. "Because there's no such thing as an empty place, uncle. There are always creatures around --wild animals, mice, insects, birds --and they can all hear." "But what if there weren't? What if the woods are truly empty?" "Why waste your time talking about an impossibility?"