Paul Auster, the American novelist, recently wrote an autobiography based on his body, and how it had fared over the decades. This is a sort of sequel, about his mind when he was young. He points out, early on, that what appear to be memories of early childhood might be something slightly different: “Perhaps you are not remembering at all, or remembering only a later remembrance of what you think you thought in that distant time which is all but lost to you now.” He is fascinated by the movie The Incredible Shrinking Man. And he memorably captures his state of mind in his twenties: a mixture of hope and despair.