The term ‘wave’ occupies a surprisingly rich and varied position across the depth-psychology corpus, operating simultaneously as a physical concept imported from quantum mechanics, a metaphysical analogy for mind-body relations, a mythological image of chthonic power, and a technical marker in longitudinal research design. The most philosophically consequential deployments appear in McGilchrist and Simondon, where wave-particle duality serves as a model for understanding how continuity and discreteness, union and division, can coexist within a single phenomenon — a move with direct implications for theories of consciousness, individuation, and the hemispheric architecture of the brain. For McGilchrist, the wave-particle dyad represents the fundamental ontological situation of a universe that is, at its base, fields rather than particles, with discrete things arising from continuous underlying process. Simondon’s engagement is more technically demanding, working through de Broglie’s double-solution theory to argue that wave and corpuscle are ‘two realities equally and simultaneously given in the object’ rather than mere complementary appearances. Pauli adds the epistemological register, linking wave phenomena to the principle of complementarity and the irreducible interference of the observer. In Hillman, the wave appears mythologically as the sea-surge that delivers Poseidon’s bull — sublime, irruptive, bearing the force of the underworld into human affairs. Across these registers, wave figures the interpenetration of the continuous and the discrete, the formless and the formed.