"That’s why there were postmen, with real feet. That’s why the clacks was a string of expensive towers. Come to that, it was why farmers grew crops and fisherman trawled nets. Oh, you could do it all by magic, you certainly could. You could wave a wand and get twinkly stars and a fresh-baked loaf. You could make fish jump out of the sea already cooked. And then, somewhere, somehow, magic would present its bill, which was always more than you could afford."