what is the "density" exactly means?

[unity100]

Not to get hung up on the point, but the astral or inner-plane entities of 3D (i.e. little people) communicate telepathically - they can navigate your unconscious and show movie-quality imagery.
Recently deceased 3D relatives, for example, can communicate telepathically with the living.
3D adepts can communicate telepathically.

So I think we pretty much have ruled out telepathy as being unique to 4D and certainly have ruled out it being a function of only an adept. And it certainly is not mere intuition or inspiration or 'inner knowing'.

It does seem to be more of a time/space phenomenon.

maybe i should have stated clearly that these considerations involve physical side of existence. surely there arent the same limitations in 3d time/space. and, time/space is itself 'etheric' (insert whatever proper word to use here) and fluid that, our considerations are probably not directly relevant to it.

our questions involve physical manifestation.