Perhaps everybody has asked this question, but risking repetition, I'd like to ask, that once we realise the nature of our first person subjective awareness that experiences everything, how does one come to conclude that that atman, which is his personal "self", expands to encapsulate all living/non-living things?

I know that matter doesn't do a good job of explaining self-identity if you recall the Ship of theseus thought experiment, so this "self", if it exists, and it clearly does because I can directly experience my existence. 

* How does then, the concept of infinite consciousness arise?
* Is it due to the nature of space: because as we move through space, we move our awareness to a different location in space (kind of like moving a diya around a dark room, illuminating different parts of the room).
* If not, is it akin to the thought of panpsychism, which explains subjective experience by postulating the presence of consciousness as a fundamental feature of matter, aka consciousness being derived from matter at the most fundamental level?