The Many Faces of the Subject-Object-Merge

The notion of a subject-object-merge shows up in many places under many different names. I present here a few samples.

Hystorian of consciousness, Morris Berman, speculates on early human consciousness being predominantly of the subject-object-merge type, calling it "participating consciousness".

A member of this cosmos was not an alienated observer of it but a direct participant in its drama. His personal destiny was bound up with its destiny, and this relationship gave meaning to his life. This type of consciousness - what I shall refer to in this book as "participating consciousness" - involves a merger, or identification, with one's surroundings, and bespeaks a psychic wholeness that has long since passed from the scene.
(Morris Berman, The Reenchantment of the World, p.16)

Another word for it: MIMESIS

MIMESIS: Greek word for imitation, and the root of English words such as "mime" and "mimicry." More broadly, submitting to the spell of a performer, or becomimg immersed in events; the state of consciousness in which the subject/object dichotomy breaks down and the person feels identified with what he or she is perceiving.
(Morris Berman, The Reenchantment of the World, p.346)

I suspect Zen is larglely based on the subject-object-merge also:

The term Zen comes from 'ch'an-na' which in the Chinese transliteration of a Sanskrit word 'dhy…na'. It signifies the mystical experience in which God and man are one or in which subjectivity and objectivity merge.
(Sohaku Ogata, Zen for the West, p.11)

Finally, the subject-object-merge is a recognized physchological phenomenon, of which Freud's notorious "oceanic feeling" is a developmental residue:

... originally the ego includes everything, later it separates off an external world from itself. Our present ego-feeling is, therefore, only a shrunken residue of a much more inclusive - indeed, an all-embracing - feeling which corresponded to a more intimate bond between the ego and the world about it. If we may assume that there are many people in whose mental life this primary ego-feeling has persisted to a greater or less degree, it would exist in them side by side with the narrower and more sharply demarcated ego-feeling of maturity [individuated consciousness], like a kind of counterpart to it. In that case, the ideational contents appropriate to it would be precisely those of limitlessness and of a bond with the universe - the same ideas with which my friend elucidated the 'oceanic' feeling.
(Sigmund Freud, Civilization and its Discontents, p.15-16)

And since then others have described it under many other names:

Preconscious unity with the environment, a state of "symbiosis" that has been called by many names - "cosmic anonymity" (Erich Neumann), "infant-world unity" (Kurt Goldstein) - has been taken by psychoanalytic theory as a given of early human life.
(Morris Berman, Coming to Our Senses, p.25)