This article presents a review of the literature concerning the concept of boundaries of the mind. The concept is defined and its major characteristics described as thickness, elasticity, permeability and flexibility. Three case reports are presented that highlight the possibilities of change to the boundaries of the mind during the psychoanalytic process. Countertransference enactments can be understood because of their effect on the psychoanalytic frame. The possibility of regulating one’s boundaries is a major component of inner freedom.