How does self-illusion happen?

We can experience, if we are attentive, how thought process functions all by itself when we fall asleep or in dreaming. The chain of thoughts happens all by itself in total hypnosis (there is no perception of anything else, only the products of thought process).

During the day in the fragmentary perception, something interesting happens with the thought process. There appears a part of thought which imagines itself as divided from and the controller (experiencer, owner, thinker) of all the other thoughts. It happens very fast and is very persistent in fragmentary perception. It is the constantly interwoven memory of 'I am this', 'that happened to me', 'I am going to do that tomorrow', etc. This self-story apparently (through horizontally arranged memories) moves in time (from 'the past' to 'the future').

To see that the division into thinker and thought is an illusion and not a fact, all thoughts have to be perceived, with all sound and all what is perceivable at the same time. Without choice, motive or effort.

In this all-encompassing observation, the absence of division is directly perceived.

What sees is all there is.