Absence
The loss of the concept of Presence happens through
the realization of the ultimate void (Sunyata), which is the absence
of conceptualization. This is another radical departure from one's
previous experience. One goes from a sense of absolute Presence
to a sense of absolute Absence. One here realizes that for the
first time a complete cessation of the sense of self is attained.
There is no experience of self or person, without consciousness
that there is no self or person. When the sense of Presence is
lost, the last foothold for the sense of self (identity or person)
is gone. In the state of Absence there is no self-consciousness
at all, and one realizes that it is the self-reflective movement
of the mind that is the core of the sense of self. (The Pearl
Beyond Price, pg 461)

There is a state of complete absence, and there
is also absence of the awareness of absence. There is no one and
nothing there. And there is nobody there to be aware that there’s
nobody and there’s nothing – complete absence of consciousness.
That is the most awakened state. (Diamond Heart Book 4, pg 127)

In the state of Absence there is no Presence, consciousness or
functioning. As functioning is needed there is then the awareness
of consciousness arising. This consciousness is experienced as
a loving Presence, spontaneously arising in the voidness of the
Absence. It is perceived to gradually transform itself into the
Presence of the Personal Essence. (The Pearl Beyond Price, pg
464)

It is not until this realization of Absence that
one realizes that usually there is a continuous and incessant
sense or feeling of self or "I". Every experience is
related to this "I". Now there is an experience and
perception of experience, but it is not related to an "I",
not even to the "I" of oneness. There is pure awareness
of phenomena, with complete absence of self or center. The Absence
is so complete that there is not even consciousness of the Absence.
The complete absorption in his condition is the cessation of all
sensation and consciousness of oneself. There is Absence and there
is absence of the consciousness of Absence. It is like deep sleep
but one is not asleep. (The Pearl Beyond Price, pg 462)

Absence and perception
In Absence one experiences oneself to be a pure subject, that
is not an object. One is the source of awareness. One is not the
witness, not the witnessing, not the witnessed. One recognizes
oneself as an Absence, unknown and unknowable. When one looks
inward there is no perception; there is absolute Absence without
consciousness of Absence, because Absence is not an object of
perception. It is in fact the absence of an object of perception.
(The Pearl Beyond Price, pg 463)

But you have to allow yourself to feel that absence, feel the
aloneness – which is the hole of the real relationship –
before you will be able to experience the real relationship. You
have to experience the absence of it completely – no relationship,
I’m empty, nothing there, no contact. When you feel that
way, you may also feel that you are not real, that you do not
exist, because you cannot exist without relationship. The moment
you allow the negative relationship to go, the mental relationship
to go, the ego starts freaking out, starts disintegrating, disappearing,
and the aloneness will be felt as some sort of emptiness, some
kind of absence of self. So when the mental relationship goes,
the part that is relating to it goes, too, and you start feeling
the absence of self, an emptiness which will be felt as an aloneness.
When the aloneness is accepted and tolerated, it is then possible
for real contact to happen, and not before that. (Diamond Heart
Book 4, pg 211)