There is only is and its content. That's it. The easiest way to see or get a sense of this is to replace any "I am ..." with "There is a ....". For example, instead of "I am thinking of writing of using stable sort", replace it with "This person have a thought of using stable sort".
This is much closer to the actual reality underneath. Even attachment itself can be put in this term. "There's a feeling that this person own this" or "There's a sense of I".
After doing, perhaps this is mental illness, I already see glimpse of the sense that everything is everything at the same time. As there are no real difference between this rock and the other rock behind the mountain that I can't see. There should be no difference between my thoughts, senses, feelings, emotions etc and that of other people. Now your sense of self captures the entirety of the universe. If you die, the universe dies for all you know. I think this is what the ancient books have been talking about by rising and being a God.