Within the depth-psychology corpus, Light and Dark constitute one of the most persistently interrogated polarities—simultaneously cosmological, psychological, and phenomenological in register. The literature refuses a simple moral hierarchy in which light equals consciousness and dark equals its absence or deficiency. Hillman, in his Senex and Puer writings, argues with precision that the very act of illuminating one sector of psychic space necessarily darkens the remainder: light and dark are co-created in the same moment out of an originary twilight, and the evolutionary narrative of light progressively conquering dark is exposed as a philosophical error. Campbell, drawing on cross-cultural mythological evidence, anchors the polarity in the experiential bedrock of the diurnal cycle, noting how dream logic—objects shining of themselves, rapid transformation—belongs distinctively to the nocturnal register. Corbin’s Iranian Sufi material introduces a decisive complication: the category of ‘black light,’ a luminous darkness surpassing ordinary consciousness rather than falling beneath it, which requires an entirely different metaphysical cartography—one with superconsciousness above and subconsciousness below the median plane of ego-awareness. The I Ching tradition, as rendered by Wilhelm, frames light and dark as the two primal powers alternately released by Tao, neither subordinate to the other. Taken together, these positions render Light and Dark not a binary of value but a dynamic, reciprocal, and ontologically generative tension at the heart of psychic life.