Vladimir Nabokov. Un cuento de hadas
Erwin cleared his throat and asked, almost in a whisper: "But— how shall I know? Let's say I've chosen one—what then?"
"Nothing," said Frau Monde. "Your feeling, your desire, are a command in themselves. However, in order that you may be sure that the deal stands, I shall have a sign given you every time—a smile, not necessarily addressed to you, a chance word in the crowd, a sudden patch of col