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Harriet, the photographer obsessed with reflections (and the main character in Objects in Mirror Are Closer Than They Appear), would have been deeply fascinated by the True Mirror, which lets us "see ourselves as others see us."
The French call it "l'esprit d'escalier," stairway wit. The witty thing you should have said that occurs to you only as you descend the stairs at the end of the evening. As a novelist, I find that I have staircase thoughts about each of my books, starting with my first novel, published in 1995.