Starting with considerations based on his psychoanalytical practice with teenagers, the author proposes a theorization of psychical issues in terms of « scenality/obscenality ». He shows the central importance of primal fantasies and the function of the intruder in the construction of intimacy and identity, as well as the relationship to the other and more than another. He then goes on to proposes a specific reading of psychoanalytical settings in terms of transformational group, of the internal scenalities and groupalities.