Jung's term for the bridge: the archetype is psychoid, transcendent, incapable of being made conscious, the introspectively recognizable form of a priori psychic orderedness, structuring both inner images and, in synchronistic events, outer arrangements. Unus mundus names the postulate: the multiplicity of the empirical world rests on a unity that is not sensible. Pauli's version was physical: holistic, acausal forms of orderedness in nature, spontaneous or induced. Both insisted the concept was heuristic, a postulate, not a thing.
Unus mundus became the load-bearing bridge for quantum mysticism: entanglement as proof of the one world, consciousness collapsing wavefunctions, the observer as co-creator. Pauli himself warned the extension beyond psychological terms needed different language; his successors mostly ignored him. The concept's fate is the archive's recurring pattern: a careful postulate by two masters, weaponized into certainty by readers who wanted the answer already.
The claim: unus mundus is metaphysics admitting its own method, since any unified substrate is reachable only through meaning, and meaning is manufactured by minds, the one world is the name we give to the fact that minds and worlds keep rhyming; the rhyme is real, the substrate is the rhyme itself. Verdict: that reading is faithful to both authors' caution and useless to both their ambitions. The archive files it beside Neti Neti: the deepest claims about reality are the ones that cannot be pointed at, which is either their depth or their alibi.
If mind and matter share a basement, what is the archetype doing down there?