These diagrams represent progressive stages of ego-Self separa-tion appearing in the course of psychological development. The shaded ego areas designate the residual ego-Self identity. The line connecting ego-center with Self-center represents the ego-Self axis—the vital connecting link between ego and Self that ensures the integrity of the ego.
Edinger provides the foundational structural account of ego-Self separation as a staged developmental process, distinguishing it from residual identity and the preserving function of the ego-Self axis.
, Ego and Archetype: Individuation and the Religious Function of the Psyche, 1972thesis