When adolescent creativeness is unable to reconstruct the I-Ego taking into account the newness of puberty, the psychoanalyst must invent a specific practice : construction work with which the adolescent can identify. When adolescent creativeness is unshared and unable to be shared, the treatment should offer common ground where a two-person perlaboration can develop, in which the conditions (usually infantile) of the impasse (breakdown) will be imagined together. We will discuss : modes of intervention, particularly their flexibility and their limits ; the difference it makes whether the adolescent brings material to the session or not ; the process in play in the analyst’s constructions (in this case sublimation, which is opposed to the control exercised by the ideal) ; the implicit risk of deconstruction in any imaginary suggestion made by the analyst.