Within the depth-psychology corpus, ‘Door’ functions as one of the most richly overdetermined liminal symbols, traversing etymology, mythography, dream analysis, and analytic theory. Benveniste establishes the philological ground: the Indo-European root dhwer- — unanalyzable, widely distributed, and almost always plural — suggests that the door was conceived not as a single element but as a compound structure, already encoding multiplicity and transition at the level of language. This etymological plurality rhymes with the symbolic plurality the term carries across the literature. For Sardello, doors are the ‘guardians of boundaries’ within the psychic topography of the house-as-soul, simultaneously dividing and connecting, maintaining the productive tension between interior regions. Ests develops the door as the threshold of forbidden knowledge: in the Bluebeard cycle, the locked door to the forbidden chamber becomes the central engine of feminine initiation, and ‘questions are the keys that cause the secret doors of the psyche to swing open.’ Jung’s dream seminars treat the door as a figure of dissociation and compensatory disclosure — a door slowly opening onto a naked child or a blinding white light indexes moments when unconscious content presses toward consciousness. Von Franz extends this into the puer’s confrontation with the uncanny: a door that ‘warns’ before entry, that precipitates collapse at the threshold, marks the crisis of incarnation. Across these voices, the door’s primary psychic valence is liminality: it is the structural condition of any passage between states of being.