The very ‘I’ is different in the two situations. It is not the ‘I’ that has pre-eminent reality — an ‘I’ that can decide to relate to ‘Its’ or ‘Thous’ that are objects floating into one’s field of vision. No, the ‘I’ is ‘betweenness’
Yalom argues, following Buber, that the I-Thou relation is not a mode chosen by a pre-existing subject but the constitutive ground in which the ‘I’ itself is shaped and perpetually recreated.
, Existential Psychotherapy, 1980thesis