There is self expansion.
And there is self contraction.
When the self expands,
You include the other as self.
When the self contracts,
What was self earlier is seen as an other.
This happens so many times in our day to day life.
What was once the most exciting thing,
After some time, once all the juice gets extracted,
The very same thing becomes a burden.
Maybe we explore a new philosophical system,
And then completely separate ourselves from that later.
All of these are cases where,
In the moment of expansion = we absorbed an other into self.
And in the moment of contraction = we detached a portion of self and made it an other.
We feel the body is self,
When we want to do so many things in the world with it.
But once we complete everything,
The body gets removed from the self,
and is seen as an other, as a kind of burden.
What was once an asset is seen as a liability.
So the implications are many.
One of them is that,
The way you treat others is eventually going to become the way you treat yourself.
This is because, initially the self is expanded, and its dominion is large (the others are far out).
But when the self contracts, what was once seen as self becomes the other, and you start treating that as such.
Your own body can become an other to you.
So the self-other is a changing dynamic,
Waxing and waning.
Expanding and contracting.
When contracted your aperture greatly shrinks.
When expanded your aperture greatly widens.
When expanded all that you thought was other becomes you.
When contracted all that you thought was you becomes an other.
That is why in profound lsd (or psychedelic) trips say,
Owing to the dramatic expansion of self/widening of aperture,
We start to connect with everything.
And similarly in our most contracted moods,
We see everything as a threatening or burdensome other,
Which might even include our entire body.