Openness in the depth-psychology corpus operates across at least three distinct registers that together reveal its centrality to psychological and philosophical inquiry. In the empirical personality literature, Openness to Experience—most rigorously treated by Johnson, Williams, and their collaborators—functions as a measurable Big Five trait with demonstrable relationships to aesthetic engagement, awe proneness, adaptive stress regulation, and post-traumatic growth. Here the term is highly operationalized, its facets (Aesthetics, Ideas, Feelings, Fantasy, Actions, Values) yielding differential predictive power across outcomes from physiological resilience to dispositional wonder. A second register, represented by Trungpa’s Tibetan Buddhist perspective, treats openness as a spiritual and ethical imperative: authentic openness to oneself is the precondition for genuine compassion toward others, and its absence constitutes self-deception. Hillman and Nussbaum introduce a third, more ambivalent reading, wherein openness is simultaneously a virtue—Nussbaum’s ‘guilelessness’ as the condition of noble character and trust—and a vulnerability, the ‘unstoppered vessel’ susceptible to dissolution or manipulation. Hillman’s Suicide and the Soul frames analytic objectivity as a form of openness that places the practitioner outside collective moral consensus. Across these registers the corpus sustains a productive tension: openness as adaptive strength, openness as spiritual prerequisite, and openness as existential risk.