This essay explores the links between Ferenczi’s understanding of psychoanalysis as a radically mutual endeavor in which unconscious communication between patient and analyst flows in both directions, his experiments in mutual analysis as reported in his Clinical Diary, and the subsequent and ongoing development of a relational theory of technique. The essay examines the ways in which Ferenczi’s radical experiments in analytic technique expanded the possibilities for joint, direct transference/countertransference exploration, illuminating the complex permutations of implicit, as well as expressive and transparent ways therapist and patient can utilize the full range of feelings, thoughts, fantasies, body, and self-states that emerge in the field of therapy.