Ego boundary formation occupies a contested yet indispensable position across the depth-psychological corpus. Freud establishes the foundational problematic in Civilization and Its Discontents, tracing how the nascent ego learns to discriminate 'inside' from 'outside' through the painful discipline of the pleasure principle yielding to the reality principle — a process rooted in somatic experience and the loss of the mother's breast. Neumann extends this developmental arc mythologically, arguing that boundary formation is the precondition of consciousness itself, the ego wresting differentiated selfhood from the undifferentiated pleroma of the uroboros. Winnicott, approaching from object-relations, frames the same achievement in terms of a 'facilitating environment' within which the true self consolidates its isolation — a protective boundary whose violation produces psychotic anxiety rather than developmental advance. Hillman, characteristically, radicalizes the critique: he identifies boundary-making with senex-consciousness, the Saturnine psychic force that organizes inner life through division, ownership, and the sacred temenos, insisting that boundaries are ontological as much as psychological necessities. Samuels surveys the developmental Jungian school, documenting how theorists such as Fordham, Gordon, and Strauss treat boundary formation as the ego's primary task against the self's pull toward fusion. The somatic tradition represented by Ogden situates boundary formation in the body itself, making it a procedural achievement of early attachment rather than a purely mental event. What unifies these positions, despite their divergence, is the recognition that without a formed boundary there can be no self, no symbol, and no relatedness — only undifferentiated merger.
In the library
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A further stimulus to the growth and formation of the ego, so that it becomes something more than a bundle of sensations, i.e. recognizes an 'outside', the external world, is afforded by the frequent, unavoidable and manifold pains and unpleasant sensations
Freud locates the origin of ego boundary formation in the infant's painful discovery of an 'outside' that resists the pleasure principle, establishing inside/outside differentiation as the foundational act of ego constitution.
Freud, Sigmund, Civilization and Its Discontents, 1930thesis
our idea of the ego and its notion of order require a boundary between real and fantasy, between inner and outer. Boundary is necessary for properties and possessions, for territory and ownership. One's own is within one's boundaries.
Hillman identifies boundary-making as constitutive of ego-consciousness itself, attributing this function to senex-consciousness, which draws the divisions that make property, selfhood, and ontological distinction possible.
The ego sums up all that is involved in separation, sense of boundary, personal identity and external achievement 'with all the images associated with one's own body and one's own personality'.
Samuels synthesizes the developmental Jungian school's consensus that the ego is defined precisely by its boundary-constituting function, distinguishing it from the self's pull toward fusion and wholeness.
Samuels, Andrew, Jung and the Post-Jungians, 1985thesis
The stability of the ego, i.e., its ability to stand firm against the disintegrative tendencies of the unconscious and the world, is developed very early, as is also the trend toward extension of consciousness.
Neumann argues that ego boundary stability is established in early childhood as the critical prerequisite for all subsequent self-formation and individuation, with its roots in the uroboric stage of undifferentiated selfhood.
Neumann, Erich, The Origins and History of Consciousness (Princeton, 2019thesis
It seems necessary to allow for the concept of the isolation of this central self as a characteristic of health. Any threat to this isolation of the true self constitutes a major anxiety at this early stage.
Winnicott reframes ego boundary formation as the protective isolation of the true self, maintained by maternal care, whose breach constitutes psychotic anxiety rather than ordinary developmental stress.
Winnicott, Donald, The Maturational Processes and the Facilitating Environment, 1965thesis
many dreads of this kind are really encoded memories of things that have already happened before full ego-formation (see Winnicott, 1963: 87)
Kalsched, drawing on Winnicott, shows that traumatic dreads in adult patients are often encoded memories of impingements that occurred before ego boundaries were consolidated, making pre-boundary experience the ground of later pathology.
Kalsched, Donald, The Inner World of Trauma: Archetypal Defences of the Personal Spirit, 1996supporting
We may also see the phase of exploration of the body as connected to the formation of a skin boundary. For the sake of completeness, I want to note some other features of Jung's contribution to the psychology of early development
Samuels links the somatic phase of bodily exploration in infant development directly to the formation of a skin boundary, situating ego boundary formation in Jung's theory of consciousness arising from islets of awareness.
Samuels, Andrew, Jung and the Post-Jungians, 1985supporting
These diagrams represent progressive stages of ego-Self separation appearing in the course of psychological development. The shaded ego areas designate the residual ego-Self identity.
Edinger diagrams ego boundary formation as a progressive separation from original identity with the Self, a developmental arc in which increasing differentiation of ego from Self constitutes psychological maturation.
Edinger, Edward F., Ego and Archetype: Individuation and the Religious Function of the Psyche, 1972supporting
This is how the ego grows and separates from its unconscious identity with the Self. At the same time we must have recurring reunion between ego and Self in order to maintain the integrity of the total personality.
Edinger presents ego boundary formation as a dialectical process of separation and reunion with the Self, warning that damage to the ego-Self axis through excessive alienation undermines psychological integrity.
Edinger, Edward F., Ego and Archetype: Individuation and the Religious Function of the Psyche, 1972supporting
ego-defences, which have tended to be seen negatively and as dispensable in a state of mental health, are now understood as a part of maturation. Provided defences are not too rigid... they cannot be seen as psychopathological.
Samuels, via Fordham, rehabilitates defensive mechanisms as integral to the maturational process of ego boundary formation, arguing that projection, introjection, and identification are constitutive rather than merely pathological operations.
Samuels, Andrew, Jung and the Post-Jungians, 1985supporting
witness the formation of what Plaut, by chance using the same term as Neumann, has called an 'emergency ego'. This seems strong, but in reality is merely brittle and incapable of allowing passage for, or relating to, the products of the imagination.
Samuels examines Plaut's concept of the 'emergency ego' as a pathological variant of boundary formation — a defensive structure that forecloses imaginative access rather than enabling flexible ego-world articulation.
Samuels, Andrew, Jung and the Post-Jungians, 1985supporting
construct a tangible and symbolic boundary around your body using string, ropes, scarves, pillows, or other objects... Take the time to place the rope or objects around your body at the distance and in the shape that feels right for you.
Ogden's sensorimotor intervention externalizes ego boundary formation as a somatic and symbolic exercise, treating the capacity to define one's own spatial boundary as a therapeutic achievement requiring direct bodily enactment.
Ogden, Pat, Sensorimotor Psychotherapy Interventions for Trauma and, 2015supporting
a somatic resource may be useful at one particular point in therapy and not at another point... one client, overwhelmed by intrusive emotions... benefited from a pushing movement to create a boundary and settle his arousal.
Ogden demonstrates that ego boundary formation in traumatized clients proceeds as a somatic achievement — the capacity to embody and enact a boundary — rather than as a purely cognitive or affective event.
Ogden, Pat, Trauma and the Body: A Sensorimotor Approach to Psychotherapy, 2006supporting
the ego learns that it must inevitably go without immediate satisfaction, postpone gratification, learn to endure a degree of pain, and altogether renounce certain sources of pleasure. Thus trained, the ego becomes 'reasonable'
Freud presents the reality principle as the disciplinary mechanism through which the ego consolidates its boundaries against instinctual pressure, with learned frustration tolerance as the mark of a formed ego.
Freud, Sigmund, Introductory Lectures on Psycho-Analysis, 1917supporting
its boundaries are set as if by its own precision instruments. The hardening process of consciousness has been represented by the symbol of the Old King.
Hillman connects the rigidification of ego boundaries to the pathological senex dynamic, where over-precision of the ego's self-demarcation produces a hardened, sterile consciousness cut off from vital process.
Hillman, James, Senex and Puer: An Aspect of the Historical and Psychological Present, 1967supporting
They tend to form 'special' relations with idealized caretakers in which ordinary boundaries are not observed. Psychoanalytic authors attribute this instability to a failure of psychological development in the formative years of early childhood.
Herman situates borderline boundary pathology in a developmental failure of ego boundary formation during early childhood, linking the inability to observe relational limits to deficits in object constancy.
Herman, Judith Lewis, Trauma and Recovery: The Aftermath of Violence—From Domestic Abuse to Political Terror, 1992supporting
At first there is maximal nurturance and containment... Later the parents will place further limits on the amount and kind of nurturance they provide, and the degree of containment is eased.
Papadopoulos describes the graduated reduction of the parental container as the environmental scaffold through which the child progressively internalizes ego boundaries, moving from maximal containment toward autonomous self-regulation.
Papadopoulos, Renos K., The Handbook of Jungian Psychology: Theory, Practice and Applications, 2006supporting
It starts out, as we see, from the system Pcpt., which is its nucleus, and begins by embracing the Pes., which is adjacent to the mnemic residues. But, as we have learnt, the ego is also unconscious.
Freud's structural account of the ego's origin in the perceptual system provides the neuropsychological grounding for ego boundary formation as the differentiation of a surface organization from the undifferentiated id.
Freud, Sigmund, The Ego and the Id, 1923supporting
Precisely because the egoic self is a mental fabrication, contemplative psychologies regard it as having no inherent reality.
Welwood introduces the Buddhist critical perspective on ego boundary formation, arguing that the boundaries constituting the egoic self are conceptual constructions lacking ontological substance — a challenge to the developmental assumption that formed boundaries are the telos of psychological maturation.
Welwood, John, Toward a Psychology of Awakening Buddhism, Psychotherapy,, 2000aside
the ego and consciousness are not disintegrated; on the contrary, there is an expansion of consciousness brought about by the ego reflecting upon itself.
Neumann argues that in the second half of life the consolidation of ego boundaries achieved in the first half is not dismantled but transcended through reflexive expansion, suggesting that individuation presupposes rather than dissolves formed boundaries.
Neumann, Erich, The Origins and History of Consciousness (Princeton, 2019aside