The epistemological congruence between the object of psychoanalysis, the theory of dreams, and the method was to produce a discovery resulting from the suspension of the variables obscuring access to it—namely, unconscious psychic reality, its formations and processes. Knowledge of the psychic space of dreams, and the discovery of the dream-work, of its internal logic and its unconscious contents then became possible. Three main propositions have organized research into dreams. The first is that of a common and shared psychic space. The second proposition contends that, alongside the dream navel, which is rooted in the bodily mycelium, it is useful to assume a second navel of dream activity, which has its roots in the intersubjective mycelium. The third proposition introduces the concept of dream polyphony. This concept describes how the dream is worked on by, and in, a multiplicity of spaces and times, images and voices.