Reunion occupies a remarkably wide semantic field within the depth-psychology corpus, functioning simultaneously as a developmental event, a mythic motif, an alchemical symbol, and a transpersonal aspiration. At the developmental register, Ainsworth’s Strange Situation paradigm, as extensively elaborated by Schore, positions reunion episodes between infant and caregiver as the privileged diagnostic moments of attachment quality: it is here, in the charged seconds following separation, that the regulatory capacity of the dyad is most nakedly revealed, and where secure, avoidant, and resistant patterns crystallize into lasting internal working models. Bowlby and Panksepp ground this developmentally in the thermoregulatory and affective-motivational systems, arguing that separation generates somatic distress that reunion directly alleviates. At the mythic and religious register, Campbell, Harvey, and Jung read reunion as the telos of the great loss-and-recovery narratives — Demeter/Persephone, Isis/Osiris, the coniunctio of alchemy — in which the restoration of the separated pair images psychic wholeness, the healing of the ego-Self split, or the soul’s return to its divine source. Jung’s alchemical writings press further still, treating reunion with the unconscious as the psychological equivalent of the opus itself. The central tension in the corpus is thus between reunion as an empirically traceable regulatory transaction and reunion as an irreducibly symbolic event pointing toward individuation.