Personal Space Boundary theory, developed by the first author in 1986, explains the complexities of privacy and intimacy within human beings. The way that people choose to relate to others is dependent on the permeability and flexibility of their personal space boundaries. The experience of trauma can damage the functioning of one's boundaries. The introduction of a new analog model of the theory, Russian Stacking Dolls, will demonstrate how the theory provides insight and facilitates healing in adults who have suffered some sort of trauma. The purpose of this article is to review the theory's evolution and provide clinical examples of how this theory is currently being used in practice with Russian Stacking Dolls. Limitations and cautions for use with certain clients are explicated.