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Today’s Freudian field is deeply divided between the dominant evolutionist option which promotes a theory of the emergence of a new psychical economy, finding its causality in the decline of the father and the return of the matriarchate on the one hand, and on the other, the structuralist point of view, which perceives in the variations of the formal envelope of the symptom many actualizations of the psychical structures discovered by Freud (neurosis, psychosis, perversion). Against the idea of the end of the father’s age, structuralism argues that the father is an “insignificant significant” and that he is all the more productive as he is dead. The high stakes of the debate on which depends the clinical and political future of psychoanalysis requires it to be clearly explained as structuring the Freudian field structural and restoring its genealogy in which we can perceive the stem cell of what remains unknown of the historical break between the young sociologist Lacan and his transference to Levi-Strauss which provoked his return to Freud in order to rebuild psychoanalysis. From there a kind of diplopia appeared, allowing the double textual body of Lacan to be perceived.