Complementarity enters the depth-psychology corpus along two converging axes: the epistemological principle imported from Niels Bohr's quantum physics, and the older philosophical intuition that opposites require one another to be what they are. Pauli is the crucial mediating figure: his essays articulate complementarity as the recognition that mutually exclusive descriptions — wave and particle, position and momentum — are jointly necessary for any complete account of an invisible reality, and he explicitly extends this logic to the relation between consciousness and the unconscious, where every act of observation is an act of interference. Jung appropriates the concept directly, arguing that the passage of unconscious content into consciousness terminates synchronistic phenomena — and vice versa — in a pattern structurally identical to Bohr's measurement problem. Von Franz sharpens the distinction between complementarity and compensation in Jungian usage, while Romanyshyn uses the concept to theorize the irreducible gap between researcher and researched in depth-psychological inquiry. McGilchrist broadens the scope still further, grounding complementarity in a metaphysics of opposites that are not merely juxtaposed but mutually generative — 'sunt complementa.' The term thus marks a fault-line in the corpus between those who treat it as a precise technical import from physics and those who absorb it into a wider vision of coincidentia oppositorum.
In the library
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The same relationship of complementarity can be observed just as easily in all those extremely common medical cases in which certain clinical symptoms disappear when the corresponding unconscious contents are made conscious.
Jung demonstrates that the physicist's complementarity principle maps directly onto the psyche: making unconscious content conscious eliminates synchronistic symptoms, and vice versa, just as measuring one quantum variable destroys access to its complement.
Jung, Carl Gustav, The Structure and Dynamics of the Psyche, 1960thesis
the western mind cannot accept such a conception of a supra-personal cosmic consciousness without a corresponding object, and must hold the middle course prescribed by the idea of complementarity.
Pauli argues that complementarity is the epistemological 'middle course' Western thought must take between pure subject and pure object, and that the unconscious in psychology exhibits the same paradoxical duality as quantum objects in physics.
Pauli, Wolfgang, Writings on Physics and Philosophy, 1994thesis
the point of view called 'complementarity', which was developed by Bohr and others for this purpose, though shared by the majority of physicists, did not remain without opposition.
Pauli introduces complementarity as Bohr's contested but majority-accepted resolution to the logical contradictions in quantum mechanics, situating it as the foundational epistemological innovation of the new physics.
Pauli, Wolfgang, Writings on Physics and Philosophy, 1994thesis
It must also express properly the complementarity between the measurement of a field with an atomic object on the one hand, and the description of the same object as source of the field on the other hand.
Pauli insists that any adequate future physical theory must formally encode complementarity so that observer and source descriptions become automatically mutually exclusive rather than merely empirically incompatible.
Pauli, Wolfgang, Writings on Physics and Philosophy, 1994thesis
In both sciences, a principle of complementarity is present. Jung's colleague C. A. Meier describes this principle as the indissoluble bond that exists between the object to be investigated and the human investigator.
Romanyshyn, following Meier, establishes complementarity as the shared epistemological foundation of quantum physics and depth psychology, grounded in the irreducible bond between investigator and investigated.
Romanyshyn, Robert D., The Wounded Researcher: Research with Soul in Mind, 2007thesis
the indissoluble bond between subject and object means there is always that gap between what one says and what wants to be spoken, between what we are able to make present and what remains absent.
Romanyshyn extends complementarity into hermeneutics: the subject-object bond means any act of articulation necessarily leaves a remainder, a gap that is structurally homologous to the quantum measurement problem.
Romanyshyn, Robert D., The Wounded Researcher: Research with Soul in Mind, 2007thesis
'Compensation' means balancing out in view of a totality; 'complementarity' means the same with the additional nuance that the complemented part is logically incompatible with the others.
Von Franz clarifies the technical distinction within Jungian usage: complementarity differs from compensation precisely because the complementary element is logically, not merely functionally, incompatible with what it completes.
von Franz, Marie-Louise, C.G. Jung: His Myth in Our Time, 1975thesis
quantum mechanics may be regarded as the rational generalisation of classical physics, and complementarity as the generalisation of causality in the narrower sense.
Pauli positions complementarity as the broadened successor concept to classical causality, a generalisation that preserves rational coherence while accommodating the observer-dependence that quantum phenomena demand.
Pauli, Wolfgang, Writings on Physics and Philosophy, 1994supporting
The difference in the consequences of the two pictures is thus just as irreconcilable as the analogous difference between the two logical relations 'either-or' and 'both-and'.
Pauli maps the wave-particle duality onto the logical opposition between exclusive and inclusive disjunction, making complementarity a claim about the structure of description rather than merely about physical measurement.
Pauli, Wolfgang, Writings on Physics and Philosophy, 1994supporting
opposites not only co-exist, but give rise to and fulfil one another ('sunt complementa'), and are conjoined (like the poles of a magnet) without any intervening boundary, while nonetheless remaining distinct as opposites.
McGilchrist grounds complementarity in a broader metaphysics of opposites, arguing that genuine complementary pairs are mutually generative rather than merely mutually limiting, and that their unity intensifies rather than dissolves their distinction.
McGilchrist, Iain, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021supporting
opposites not only co-exist, but give rise to and fulfil one another ('sunt complementa'), and are conjoined (like the poles of a magnet) without any intervening boundary, while nonetheless remaining distinct as opposites.
McGilchrist grounds complementarity in a broader metaphysics of opposites, arguing that genuine complementary pairs are mutually generative rather than merely mutually limiting, and that their unity intensifies rather than dissolves their distinction.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
these conjunctions of opposites are not expressive of symmetry, but of the complementarity of elements that are fundamentally asymmetrical.
McGilchrist distinguishes complementarity from symmetry, insisting that the opposites which require one another are not mirror-images but structurally asymmetrical — a distinction that underwrites his hemisphere thesis.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021supporting
archetypes — whose content, if any, cannot be represented to the mind … manifest themselves only through their ability to organize images and ideas, and this is always an unconscious process which cannot be detected until afterwards.
In the Jung-Pauli collaboration, the archetype functions as the psyche's complement to the physicist's unobservable quantum potential: both are real, structuring, and intrinsically resistant to direct representation.
Jung, C. G. and Pauli, Wolfgang, The Interpretation of Nature and the Psyche, 1955supporting
Evdokimov's sense of the complementarity of male and female was something he would follow up by drawing on Jung in his later works.
Louth traces how the Orthodox theologian Evdokimov appropriated Jungian complementarity to theorize male-female polarity within a sophiological framework, illustrating the term's migration into theological anthropology.
Louth, Andrew, Modern Orthodox Thinkers: From the Philokalia to the Presentsupporting
This complementarity may have roots in a similar fundamental complementarity of premonetary society.
Seaford uses complementarity in a socio-historical register to describe the structural opposition between sacred non-exchangeable goods and circulating valuables in archaic Greek gift economies.
Seaford, Richard, Money and the Early Greek Mind: Homer, Philosophy, Tragedy, 2004aside
My arguments about the patterns of complementarity between the Iliad and the Odyssey can be extended much further.
Nagy employs complementarity as a literary-structural term to describe the mutually completing narrative patterns between the two Homeric epics, without engaging the psychological or physical senses of the concept.
Gregory Nagy, The Best of the Achaeans: Concepts of the Hero in Archaic Greek Poetry, 1979aside