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The author examines the adjustment of a method in psychotherapy with teenagers with borderline personality disorder through their use of multimedia, especially music. The use of music in a therapeutic session recalls a singular experience for the therapist as well as for the adolescent, which can lead to a reciprocal exchange of an emotional experience forming a true “musical squiggle game.” This adjustment draws a form of communication which the teenager appropriates and therefore, he becomes involved in the method. The musical squiggle seems to allow the remobilization of processes specific to the transitional experience henceforth well-known concerning the young child.