OK.
Just a quick clarification of the "logical" bit:
On purely logical grounds, for one: any 'me' that is sighted is another object witnessed by . . . by what? By something that is not 'me'.
Whatever I see is an object and cannot be I or me.
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2) Explain in detail what the illusion of separate self is, when it starts and how it works.
The illusion is that I am in charge of what I think and do. That there is a 'me', a discrete and separate entity, looking out through these eyes at a separate world. That this entity really exists in and of itself.
Clearly it starts in early childhood. It has to be learned. In a thousand ways a child is told, "you are this and that, you have these and these qualities, and you are responsible for your actions." The original belief gets elaborated in the course of a lifetime.
On a more immediate level, the illusion starts all the time as the thought: "I did this," I heard that," "I shouldn't have done that," etc.
It works the way all beliefs work. There's an assertion, a statement, a description, containing the words "I" and "me", like: "I'm typing, I'm thinking, I'm looking for the right words, I'm in charge of this part of the dialogue," etc. It doesn't have to get spelled out. The "me" feeling already contains the label "me", it's a practiced, habitual operation of thought. It works so long as it's believed in.
3) How does it feel to see this?
This is not a new realization for me, so there isn't a big Aha! quality in it. I don't think I can recreate the state of mind that preceded the realization, nor do I want to! It's simply so much freer this way. There has been a great decrease in the frequency, intensity, and duration of afflictive emotions. There's less resistance to experiencing whatever comes up. Just an easier movement through situations most of the time. When habitual knots of resistance to the flow of experience show up, they're welcomed or at least countenanced with the knowledge that this contraction around an apparent self is not really based on anything true. So these knots dissolve relatively easily. There's more confidence in living, definitely more joy. Less defensiveness. More courage to meet new situations and challenges. More sensitivity too. More pleasure in sights, sounds.
4) How would you describe it to somebody who has never heard about this illusion but is curious about it.
I might say something like: Notice the sounds you're hearing, like the chirping of these birds right now. Notice the habitual thought: "I hear that." Now just pay attention to how sound happens. Take your time with it. Are you doing the hearing, or is it just happening?
I think most people would recognize that it's just happening.
Then maybe I'd say: So where does the "I" come in? Doesn't the thought "I heard that" come after the sound? In the moment of hearing, is there an "I"? And when the "I"-thought comes, isn;t it clearly a thought? Is it anything other than that?
It's an illusion that there's a "you" that is living your life. There's just life and the movement of life. WHat we just did with hearing can be seen through all the other senses, and through thoughts too. There isn't a "you" who thinks "your" thoughts. Don't take my word for it. Just look.
5) What was the last bit that pushed you over, made you look?
what was pushed over was a belief in "awakeness" as a steady state, and a perfectionistic demand to be free of the coming and going of identifications. I think reading over these words of yours several times pulled the string that unraveled that fantasy:
identification with the story is also part of story.
Attachment to pleasure, and fear of pain- is also a story.
there is nothing that attaches, only story about attachment.
The story I was believing was one in which "I" fell victim to attachments and fears.
There is only life and its movement from moment to moment. It is a delight to be free of "me"!