Let's take a look at what I like to formulate as the "who watches the watchers" problem:

There is self, consiousness of self, consciousness of consciousness of self, consciousness of consciousness of consciousness of self, etc.

This is the 'up' direction, the 'outwardness' of awareness.
The consciousness expands beyond that of the prime self.

If you proceed to infinity, sooner or later the consciousness is thrown out of whack.

To me the two aspects of the logical conclusion are:
Consciousness (as a whole) doesn't exist.
Consciousness is the only thing that truly is.

I usually refer to the first aspect is the process/state as the Void.

The thing I refer to as the Abyss is going the other way around:

There is self, consciousness of subpart of self (and only of that part),
consciousness of subpart of subpart of self (and only of that part),
consciousness of subpart of subpart of subpart of self (and only of that
part).

This is the 'down' direction, the 'implosion' of awareness.
The consciousness fractures below that of the prime self.

The logical conclusion of this process is:
Consciousness is (infinitely) fractalized.

Both processes result in a destruction/change of 'self'.

At one point we arrive at the same <nothing/everything/whatever>, be it black holes or white wholes. When Connection is, All is!

Nevertheless, the Abyss process gained us another valuable aspect, another valuable tool besides the Void aspect. It gives additional meanings to 'wholeness', 'oneness', 'movement', 'self' etc.

Both processes are more or less obviously two sides of the same coin, yet we most often take the first way (the Void) because we are feeling 'down' by default (the 'down' movement happens by our consesus reality, it drags us 'down'), until a certain point. Almost always, from a perception of a 'normal' self, we aspire to go 'up'. The 'down' movement happens by inertia of forces 'outside' of self, so we don't really consider that approach by default.

In my experience, to be able to Flow 'downward' as well as 'upward', an additional batch of fears have to be shattered - the consiousness has to be fluid within and without its (not/)existence. A 'self', a (not/)identity to be constructed at this (whatever) requires quite a different set of (not/)axioms.