Talking about ghosts and a possible ghost world is a very difficult, strange and confusing subject, and it does not help that there is no 'hard evidence' for the existence of spirits, ghosts or any other pure non-physical entities. However, undoubtedly, we all have heard many stories about ghosts, spirits and other unexplainable mysterious ghost-related events, possibly including extraordinary psychokinetic phenomenon.
How would we describe these non-physical entities? What would be the characteristics of such a pure spiritual being? Let's look at a few of the names that they have been known under: