Earlier in the day, the doctor had a map divided into superego, ego, and id, with all kinds of squiggly, perhaps broken, lines running among those three areas.
See, the station wagon is the ego, sturdy and reliable, and the sedan is the superego, because it’s how you want to present yourself, powerful and impressive, and the sports car is the id—it’s the id because it’s irrepressible and fast and dangerous and maybe a little forbidden.
There are no more uses of "superego" in the book.
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Yes, with your talent, my friend, you could work subconscious miracles, soothe the aching id and heal the wounded superego.