The author explores the vicissitudes of the reality principle that called Freud’s attention quite early on and engaged his thinking throughout his life time. At the beginning of Freud’s investigation distortions of reality usually were associated with psychosis. However, the term psychosis has also been and continues to be far from being univocally defined, both from a theoretical and a clinical perspective. Freudian and post Freudian developments ¬both theoretical and clinical - have provided psychoanalysts with a better understanding of early primary psychic vicissitudes at play in many different pathologies placed under the general umbrella of psychosis. A better understanding of such pathologies, placed under the umbrella of psychosis, necessarily confronts us with the need to review the criteria of analysability or that of non analysability.
Keywords: Psychosis, internal reality, external reality, analysability.