Gross, subtle, causal
Avatar Adi Da describes conditional existence as having three dimensionsgross, subtle, and causal.
Gross means made up of material (or physical) elements. The gross (or physical) dimension is therefore associated with the physical body, and also with experience in the waking state.
The subtle dimension, which is senior to and pervades the gross dimension, includes the etheric (or energetic), lower mental (or verbal-intentional and lower psychic), and higher mental (or deeper psychic, mystical, and discriminative) functions, and is associated with experience in the dreaming state. In the human psycho-physical structure, the subtle dimension is primarily associated with the ascending energies of the spine, the brain core, and the subtle centers of mind in the higher brain.
The causal dimension is senior to and pervades both the gross and the subtle dimensions. It is the root of attention, or the essence of the separate and separative ego-I. The causal dimension is associated with the right side of the heart, specifically with the sinoatrial node, or pacemaker (the psycho-physical source of the heartbeat). Its corresponding state of consciousness is the formless awareness of deep sleep.