"My presence in your world would be of  hallucinatory status in your terms, for the dead are "out of time" with the "display": on your screen of reality. Our mental images no longer coincide with your space-time coordinates, but go off vertically, so to speak, at the point of death, forming angles of experience in some ways adjacent to yours, but no longer connecting. We can experience  events that are quite physical to us, but they do not appear in your continuum and are not imprinted there. 

 On the other hand, it is impossible to say where my "here" is, in usual worldly terms.

First of all, the strict orientation of physical consciousness, again, is largely learned - consciousness being infinitely adaptable - so the infant learns to focus its awareness through the nervous system, pinpointing events in time and space. These are initially inner events however that  affect the objective field in a certain way, forming time-space references Those places and times require the physical nervous system for objective placement through projection outward into the exterior medium.

  The Dead cannot physically interlude again without birth into that system."

 - Pp 107-108