These mysteries clearly bothered him--he went to great (often absurd) lengths to explain dream imagery in terms of childhood sexual trauma, a component of his theory jettisoned mid-century, though now popular among recovered-memory therapists. His dispassionate analyses of his own dreams are excellent studies for cognitive scientists wishing to learn how to sacrifice their vanities for the cause of learning. Freud said of the work contained in The Interpretation of Dreams, "Insight such as this falls to one's lot but once in a lifetime." One would have to feel quite fortunate to shake the world even once. --Rob Lightner