What is synchronicity?

Synchronicity is Jung's name for the acausal connecting principle — the hypothesis that psychic and physical events can coincide in meaning without standing in any causal relation to one another. It is not a mystical claim dressed in psychological language; it is a precise epistemological intervention, one that Jung spent decades hesitating to publish. In the foreword to his 1952 monograph he admits as much:

In writing this paper I have, so to speak, made good a promise which for many years I lacked the courage to fulfil. The difficulties of the problem and its presentation seemed to me too great; too great the intellectual responsibility without which such a subject cannot be tackled.

The hesitation is telling. Jung was not a credulous man, and synchronicity is not an easy idea. Its core claim is that causality — the sovereign principle of classical physics and of most Western epistemology since Newton — is not the only connective tissue in nature. Alongside it runs what Jung called "acausal orderedness": a tendency for events to arrange themselves into meaningful patterns that cannot be traced to prior causes. The paradigm case is famous: a patient recounting a dream of a golden scarab, at the very moment a scarab-like beetle tapped against the consulting room window. The inner event and the outer event shared a meaning — the scarab as rebirth symbol was alive in the room — but no causal chain connected them.

The concept has both a narrow and a broad definition, and the distinction matters. In the narrow sense, synchronicity names the meaningful coincidence of a psychic state with an external event: a dream that anticipates a death, an image that materializes in the world. In the broader sense, it names a general principle of acausal orderedness in nature — one that includes the properties of prime numbers, the discontinuities of quantum physics, and any domain where pattern appears without mechanistic derivation. Stein maps this precisely: the narrow definition is a special case of the broader cosmological claim, the point at which the undivided background of the unus mundus registers within differentiated experience (Stein, 1998).

The ontological ground of synchronicity is the psychoid stratum of the archetype — the level at which the distinction between psyche and matter dissolves. Jung formulated this with care:

Archetypal equivalences are contingent to causal determination, that is to say there exist between them and the causal processes no relations that conform to law. They seem, therefore, to represent a special instance of randomness or chance... It is difficult to divest conceptual language of its causalistic colouring. Thus the word "underlying," despite its causalistic connotation, does not refer to anything causal, but simply to an...

The archetype does not cause the synchronistic event; it appears in it. Von Franz sharpens this: "An archetypal arrangement 'appears' or becomes 'visible' in a synchronistic event; it does not cause it. It is a creatio, and that means the spontaneous arising of something entirely new ex nihilo that is not causally predetermined" (von Franz, 2014). This is why synchronistic events carry numinosity — they feel like irruptions of a different order of reality, because in a precise sense they are.

The intellectual lineage is worth tracing briefly. Jung's first inkling came from conversations with Einstein in the 1909–12 period, when relativity was dismantling the absolute status of space and time. If space and time are not fixed containers but relative to the observer, then causality — which presupposes them — cannot be absolute either. Decades later, the collaboration with Wolfgang Pauli produced The Interpretation of Nature and the Psyche (1955), in which Jung and Pauli jointly proposed a quaternary model of natural explanation: indestructible energy, the space-time continuum, causality, and synchronicity as a fourth coordinate — "inconstant connection through contingence, equivalence, or meaning" (Jung and Pauli, 1955). The schema is not decorative; it is an argument that meaning belongs in the description of nature alongside mechanism.

Tarnas has noted that Jung's later formulations, under pressure to align with parapsychological research and quantum physics, somewhat obscured the original insight — which was rooted in the qualitative character of a moment, the sense that things arising together share the signature of their time (Tarnas, 2006). The golden scarab is not primarily evidence for ESP; it is evidence that the world can speak in the language of the soul's situation.

What synchronicity ultimately proposes is that the psyche is not sealed inside the skull. The objective psyche — the collective unconscious with its archetypal structures — participates in a reality that is not bounded by the skin of the individual. When an archetype is constellated, when the soul is in what Jung called an abaissement du niveau mental and the unconscious is energized, the threshold between inner and outer becomes permeable. The world, at such moments, is not merely backdrop. It is participant.

  • Unus Mundus — the alchemical doctrine of the primordial psychophysical unity that synchronicity presupposes
  • Archetype — the psychoid ordering factor whose constellations generate synchronistic events
  • Marie-Louise von Franz — Jung's closest collaborator, who extended synchronicity into number theory and the philosophy of matter
  • Richard Tarnas — author of Cosmos and Psyche, which applies synchronistic logic to archetypal astrology

Sources Cited

  • Jung, C.G., 1960, The Structure and Dynamics of the Psyche
  • Jung, C.G. and Pauli, Wolfgang, 1955, The Interpretation of Nature and the Psyche
  • von Franz, Marie-Louise, 2014, Psyche and Matter
  • Stein, Murray, 1998, Jung's Map of the Soul
  • Tarnas, Richard, 2006, Cosmos and Psyche