‘I AM’ must have worked as a koan for Nisargadatta M. He laboured with it for three years till the “code” was cracked. He later said that it s a hydra that must be killed (the only, or final obstacle to be surmounted). Same with ‘beingness’, or ‘Being’, though this last is closest. Reality is beyond both being and not being, even though all these terms, including ‘reality’ are only concepts (actually, serving as pointers or signs to facilitate understanding).
‘I’ is the only subject whose object is Itself. It is the only witness. Thus, that polarity is annuled. If we say it is a verb, we still have a problem, since this gives the idea of dynamism (moving, acting, life), leaving out the corresponding idea/s of rest, staticness, changelessness. ‘I’, IT, is beyond both qualities or attributes, activity and rest. ‘Changelessness’ is of its nature, paradoxes bein inevitable in this terrain. Words such as ’consciousness’, ‘awareness’ are among the most appropriate.