The peculiar arrangement of the psychoanalyst's office for an analytic session seems inexplicable. The analyst sits in a chair out of sight while the patient lies on a couch facing away. It has been this way since Freud, although, as Nathan Kravis points out in On the Couch, this practice is grounded more in the cultural history of reclining posture than in empirical research. Kravis, himself a practicing psychoanalyst, shows that the tradition of recumbent speech wasn't dreamed up by Freud but can be traced back to ancient Greece, where guests reclined on couches at the...