The author reached a level in meditation that rare people do. He says: I believe that the human physical system has two main compartments – the outer or the upper, and the inner or the deeper. Most spiritual philosophers describe, what I call the ‘deeper’ as ‘subtle’ or ‘astral’ body and diagrammatically depict it as being above the outer body. As I experienced, the second physical system exists inside the body itself; I call it the inner or the deeper physical. The two compartments are closely interlinked, with constant interaction, without a clear-cut line of demarcation and have a considerable overlap in functions and responses. I subdivide each of the two compartments further into two parts – the upper into physical and physical-spiritual, and the deeper into spiritual-physical and spiritual. The difference between the physical-spiritual and the spiritual-physical is that the former is more physically active and less active spiritually and the latter is the other way around. I describe these four as Physical, Bio-Spiritual, Spiritual-Physical and Spiritual. My experience so far is limited to the Bio-Spiritual and it appears to me that the next stage would have greater spiritual content till the eventual stage when nothing will exist except the self.