Betweenness occupies a generative, if undertheorized, position across the depth-psychology corpus. Its principal theorists approach it from three distinct angles. McGilchrist, the most sustained voice, treats betweenness as the ontological ground of relation itself — the space in which music, poetry, perception, and selfhood actually occur, and whose collapse in schizophrenia marks a diagnostically legible failure of the right hemisphere’s integrative function. For McGilchrist, betweenness is neither a subjective projection nor a mere logical interval: it is the ‘whole that the notes and the silence make together,’ irreducible to either term. A second major treatment appears in Yalom’s reading of Buber, where the I-Thou relation reconstitutes the very ‘I’ as betweenness — the self is not a pre-given entity that then enters relation, but is constituted in and through the relational gap. Miller, drawing on Hölderlin and Nietzsche, historicizes betweenness as the liminal cultural time of divine absence, the interval ‘between the No-more of the gods that have fled and the Not-yet of the god that is coming.’ The tensions among these positions — neurological, existential, and mythological — reveal betweenness as a concept that simultaneously names a perceptual modality, an ontological condition, and a historical predicament. Its stakes are nothing less than the coherence of self, world, and meaning.