“Shame about all the rubbish. It always turns up, doesn’t it…” “Yes,” said Lu-Tze. “It’s part of the pattern.” “What? The old cigarette packet?” “Certainly. That invokes the element of air,” said Sweeper. “And the cat doings?” “To remind us that disharmony, like a cat, gets everywhere.”
―
Terry Pratchett,
Night Watch