A case is presented of an analytic patient who reported adolescent and adult mirror masturbation in the context of a struggle for psychic differentiation and separation from his mother. A model is elaborated in which magical manipulation and transformation of the self- and object images are facilitated by masturbatory mirror play. The role of impersonation and transformation as another man or woman is explored. Visual hunger, traumatic overstimulation, incestuous games, and fear of actually committing incest with a seductive parent are proposed as genetic contributants. Mirror masturbation is understood as a dramatic play which defends against castration anxiety and attempts to master childhood sexual overstimulation by active repetition and re-creation.