ATTN: what is this feeling of existential loneliness?

In my theory of attention , that is to say, in the attention language, i consider two primary senses to co-exist. One is the world of physical senses, of feelings, as the awareness of the inner world of attention, with intuition as its source. The other is the world of mental senses, of emotions, as the awareness of the outer world of reality, with mind as its source.

I believe the feeling of loneliness is at the crossroads of these two worlds.