The onset of puberty confronts adolescents with a second aesthetic conflict, and gives a second chance for the elaboration of adhesive identification. This partial or major regression can reactivate autistic cores that, if elaborated, can foster development thanks to the formation of a psychical container for emotional content. If the re-elaboration of adhesive identity and that of the aesthetic conflict cannot be made jointly, the adolescent can tip towards the pathological side : various addictions, schizoid and/or autistic defenses. The passage from two dimensions to three or even four dimensions can not be organized.