The four seasons occupy a richly polysemous position in the depth-psychology corpus, functioning simultaneously as cosmological schema, archetypal quaternary, and temporal structure of psychic life. The most sustained treatments arise from the I Ching commentarial tradition, where the seasons are neither decorative background nor mere agricultural fact but constitute what Ritsema and Karcher term ‘the four dynamic qualities of time that make up the year and the Time Cycle.’ In the Taoist I Ching commentaries of Liu I-ming and Thomas Cleary, the seasonal cycle encodes the very logic of inner transformation: creation, development, fruition, and consummation mirror spring, summer, autumn, and winter as a single integrated movement of yang and yin. Jung’s alignment of the seasonal quaternary with the four psychological functions—via Paracelsus’s Scaiolae and the four elements—represents the corpus’s most explicit depth-psychological assimilation of seasonal symbolism, grounding what might otherwise remain cosmological poetry in the structure of consciousness itself. Harrison’s philological contribution complicates any facile fourfold scheme by recovering the archaic Greek dyad of fruitful and fruitless seasons, prior to the imposition of four Horae. Bly, drawing on fairy-tale analysis, treats completeness through the fourfold as a psychological imperative: three seasons without spring constitute a wound to the psyche. The field thus spans cosmological necessity, archetypal totality, ritual calendar, and the structure of conscious orientation.