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As far as television and movies are concerned, all non-corporeal beings seem to have a firm footing on the ground they walk upon. Despite this, they can walk through walls and pass through all other solid matter on our three-dimensional plane. This seems to be the case whether they’re ghosts, spirits, poltergeists, or demons. We even have people from Parallel Universes or simply the sub-atomic level altered who are not totally phased into our reality that...