How is Reality in the Objective World Established?...

Therefore, looking from the top or from the bottom, the world is found to be nothing
but the Reality.

Atma: The unconditioned ‘I’

First emanation: ‘I know I am.’ The most generic thought. Here I am witness of
the generic thought.

Second emanation: Then you come to the particular thoughts – including time,
space and causality – establishing the whole realm of the mind. Immediately,
you become the ‘thinker’ in the triputi (of the thinker, thinking and thought).

Third emanation: Further down, you become the ‘perceiver’, in a world of sense
perceptions.

Fourth emanation: Finally, you come down to be a ‘doer’, in a gross world of
bodies and actions.

This is the order in which the unconditioned ‘I’ manifests itself in different stages.
And to return to the same unconditioned state, you have to ascend in the same order,
relinquishing the accretions one by one.

excerpt from 448. HOW IS REALITY IN THE OBJECTIVE WORLD ESTABLISHED?
Shri Atmananda from Spiritual Discourses..