Jung and Pauli conjectured that they were dealing with a link between the apparently disparate realities of matter and mind. Jung objected to the dualism implied by suggesting these two aspects are distinct kinds of stuff, and so sought a unitary dimension beneath the dualism. In this, he is far from unusual: philosophers and mystics alike have discerned what Jung called the unus mundus or unitary world.Archetypes, as implicit structuring principles, provide a way of conceptualising the common ground shared by mind and matter.
Pauli called it a "missing link", though he was also very aware of the accusation of providing mystification rather than explanation. "In my own view it is only a narrow passage of truth (no matter whether scientific or other truth) that passes between the Scylla of a blue fog of mysticism and the Charybdis of a sterile rationalism," he observed. "This will always be full of pitfalls and one can fall down on both sides."
Individuals from Plato to Spinoza have similarly tried to chart that fine course. However, apart from the breakthroughs such intuitions produced, Pauli had reason to trust that the world was odder than he might otherwise think. . . .