Who Can Mark The Limits Of Night?

Who can mark the limits of Night ... or the moods of a woman? (Roger Zelazny, "Lord of Light".)

A man finds a magic lamp, rubs it and a genie appears. The genie says, "Master, for freeing me, I will grant you one wish". The man says: "I have always wanted to go to Hawaii but I am afraid of flying. Can you build me a bridge?" The genie replies: "Were I to do that, I would use up half the steel and concrete in the world. Please ask for something else". The man says, "I have always wanted to understand how women think". And the genie says: "Do you want a suspension bridge or a multiple-arched bridge?"