It's completely logical," explained the Dodecahedron. "The more you want, the less you get, and the less you get, the more you have. Simple arithmetic, that's all. Suppose you had something and added something to it. What would that make?""More," said Milo quickly."Quite correct," he nodded. "Now suppose you had something and added nothing to it. What would you have?""The same," he answered again, without much conviction. "Splendid," cried the Dodecahedron. "And suppose you had something and added less than nothing to it. What would you have then?""FAMINE!" roared the anguished Humbug, who suddenly realized that that was exactly what he'd eaten twenty-three bowls of.
Norton Juster, The Phantom Tollbooth
arithmetic, logic