Though often charged to be prophets, not least by their own followers, neither Freud nor Jung founded new religions. They were not cult leaders, but imperious pioneers of the unconscious. There were both political and intellectual reasons that they needed one another in the early, heady days of discovery. For what they were seeking to illuminate was deeply strange, even if today it is an idea that has the worn familiarity of a cliché. The implication of the theory of the unconscious, as Richard Rorty once noted, is that there is something in us like another person that has just as good a claim to be ‘us’ as our conscious minds. Perhaps the intense oddness of the friendship between the two men reflects just how startling this idea was, and remains.