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Through the exploration of a clinical case, this article will discuss what is at stake in the process of subjectivation in the adolescent, and also the obstacles that stand in the way of the process. The adolescent, confronted with internal and external otherness, tries to ensure the continuity of his identity even as he is undergoing transformation. We will show how the therapeutic encounter, as a transitional space, can foster the play of identifications and the gradual uniting of the of the split-off parts of the personality that is undergoing subjectivation.