This paper describes the relationship between the experiential aspects of the concept of inner space and of emptiness. This is based on the change of inner experience of a borderline patient during analysis from one of empty space to one of real space. The analysis is described and the relationship of inner space to schizoid and depressive emptiness elaborated, together with the emergence of a healthy inner space (positive emptiness). The components of the capacity to experience inner space from infancy onwards are enumerated and discussed.