self 0: simple capacity for awareness. self 1: some objects of awareness too, at least conscious thoughts, mind-filling emotions, directly streamed body motions/senses.
selves 0, 1, 2 and 3 are: the window of consciousness; streams in window of consciousness; whole mind/emotions; whole body.
Why discuss such things at all? Right now, I'm working on how these concepts can lead to understanding & better using some surprisingly special value & importances of explicitly mirroring & processing more of life in words & sentences: printed, spoken and even whispered.