It consists of the 3 bodies out of the seven immortal bodies that each of us humans have.
The Higher Self accumulates the lessons and experiences learned using the Lower Ego after each death. It evolves every time
These are:
o The Higher Mental Body or our Fourth Dimension: it is the body where all our psychic potential and extrasensory perception are located.
o The Body of the Soul or the Cathedral of the Spirit: which is the collection of the experiences of our past lives.
o The Body of the Spirit: which is consciousness.
It's like at the end of a day of school and we go back home. Our personality disappears, the roll that we played is no longer needed and the actor, our real self, the immortal being revises what we've learned in this life.
We stay in the spiritual dimensions deciding what we need to learn next and wait for the proper environment, family, place, sickness, tribulations, tests, what sex and personality we need for those lessons in our next life, like another day at school.
Then we reincarnate again when it's time.
Links
The Seven Bodies
https://cosmicsong.org/index.php/dictionary/the-seven-bodies
Lower Ego
https://cosmicsong.org/index.php/dictionary/lower-ego
Cosmic Hierarchy, Dimensions
https://cosmicsong.org/index.php/dictionary/cosmic-hierarchy
Death. What happens when we pass
https://cosmicsong.org/index.php/dictionary/death