The breast occupies a peculiarly overdetermined position in the depth-psychology corpus, drawing simultaneous attention from object-relations theorists, archetypal psychologists, and mythographers. For Melanie Klein, the breast is nothing less than the inaugural object of psychic life: split into ‘good’ and ‘bad’ poles, it constitutes the prototype of all subsequent object-relations, the original theatre of envy, gratification, and persecutory anxiety. Bion extends this Kleinian inheritance, treating the breast not merely as a nutritive object but as the first container for the infant’s projective identifications, with the absent or inadequate breast becoming the very model of frustration and the ‘bad object’ that necessitates thinking. Winnicott reframes the question ontologically: the mother’s breast that simply ‘is’ permits the infant to ‘be,’ grounding the capacity for existence itself prior to any instinctual drama. Against these clinical voices, Hillman insists the breast has been impoverished by its reduction to Freudian pars pro toto—the Great World Cow’s udder—arguing instead that milk drunk at the breast is tasted wisdom, the prima materia of genuine sapientia. Neumann and Campbell situate the breast within the vast iconographic horizon of the Great Mother archetype, tracing the spiral and vessel symbolism of Neolithic goddess figures. Estés reclaims the breast as an emblem of embodied female self-knowledge. Across these positions runs a productive tension between the breast as clinical object and as living symbol.