The dissertation consists of theoretical research proposing the argument that the attacks on the setting, often undertaken by borderline patients, consists on a clinical way of reaching the use of an object. The aggressiveness not well handled by the environment affects the recognition of the externality, resulting in a tendency towards destruction which becomes the central feature in the borderline clinic. The unsuccessful work of the negative precludes the construction of an absence space in the psyche, fundamental to the construction of representations, the introduction of intrapsychic and intersubjective borders, as the investment in substitute objects. Losses related to aggressiveness and the work of the negative result in precarious boundaries between self and other, suggesting the prevalence of a relationship based in the subjective aspect of the object, not just recognized in his external nature. The contributions of Winnicott and Green underlie our hypothesis that the destructiveness – expressed in borderline clinic through the attacks on the setting – consists in an actuated way to reach the use of the object, which consolidates the unity of self while enables the recognition of the object in shared reality.