Shell
If you go very deep inside yourself, you'll see that what you
take yourself to be is not real. One way of experiencing this
is feeling that you are an empty shell, with nothing of any significance
inside. The ego identity, the core of the personality with a sense
of self, can be directly felt as a dry, empty shell. When you
see through the personality shell and become aware of the emptiness
inside, you become aware of the sense of meaninglessness, worthlessness
and the insignificance. We usually feel this emptiness in vague
ways, rather than directly. (Diamond Heart Book 3, pg 43)

We call the totality of the self-images the "shell,"
because the sense of being a shell-like structure surrounding
an empty space is a very common way that people experience the
normal identity as it becomes conscious. Normally, of course,
this structure is unconscious; one doesn't experience the shell
as a shell, one simply experiences a sense of identity. For most
people, this shell is not a grandiose self; it's just a sense
of identity. For the narcissistic personality, the sense of identity
is a grandiose self because the grandiose component self-representations
dominate the sense of identity. (The Point of Existence, pg 219)

This shell, then, is simply the soul, structuring itself through
the self-image. It is the self-structured by the totality of all
self-representations. It includes trying to be a certain way in
order to be recognized and loved, but it also includes any image
through which we define ourselves. Thus, the shell exists at several
levels, depending on what dimension of identity we are aware of.
Any definition of ourselves through an image, or through any concept,
will at some point be seen as a shell. The moment we know ourselves
through the mind, we become a shell. Even an image of the Essential
Identity itself can become part of the shell. (The Point of Existence,
pg 306)

Shell, individuation and narcissism
The student will realize that his usual sense of being an individual
is really an empty shell. This empty shell will be exposed when
his autonomy, or his capacities, are not mirrored adequately,
or when he feels they are not, if, for example, the mirror transference
is disturbed. Then he will feel narcissistically hurt and might
resort to narcissistic rage. But allowing the hurt and the sense
of betrayal will reveal the emptiness underlying his sense of
being a person. Allowing this emptiness will make it possible
for his Essence to arise. The essential Presence that arises will
not be the Essential Identity with its singular radiance, but
rather, the Personal Essence with its fullness and roundedness.
Since the empty shell associated with this form of narcissism
is the structure of the ego individuality, which develops through
the process of separation-individuation, the history of individuation
narcissism can best be seen in terms of this process. (The Point
of Existence, pg 365)

Levels of shell
There exists only one shell that returns with deeper, more primitive
and fundamental layers of its structure every time that Being
presents itself in a subtler manifestation. This is in accord
with the formulations of object relations theory, which views
each psychic structure as composed of many representations, from
various stages of development, integrated as a cohesive whole.
Investigating such a structure means it will reveal its constituent
representations. When we investigate the self-identity structure,
these appear as different levels of the empty shell. (The Point
of Existence, pg 561)

Shell and personality
This means that if the totality of the personality is seen objectively
and graphically it looks like an empty shell; the shell is composed
of many layers, each standing for a self-representation. Identifying
with the shell gives the feeling of self or identity. When one
ceases identifying with the shell as a whole there will emerge
the experience of deficient emptiness, accompanied by the affect
of the sense of no self. The sense of being an empty shell, when
it is finally perceived, is accompanied by the feeling of being
fake and a sense of shame that is a reaction to the fakeness.
(The Void, pg 136)