I will start with a simple fact: the ghosts are gray bodies (in optical terms, not in the terms of appearance). This looks like a plausible explanation to many witnesses, but in that Sense ghosts are similar to us, living humans.
In majority of witnesses ghosts appear in a colorless or monochromatic (ghostly gray or green or even black) variety. The latter happens quite often due to the nature of manifestation. If, for example, the image of a ghost is revealed over the condensation of water vapor or via Smoke of incense, then so will be the color of the ghost - it will be the color of vapor or smoke. If ghosts appear in dusk and manifest themselves via absorption of light, then they appear to us like mere semitransparent colorless shadows. However, if ghosts would be always mere shadows, this would solve the issue completely, but there is a Substantial number of witnesses (my own included) with ghosts possessing colors pretty much similar to ours. That is, in those cases ghosts carry colors, and hence have individual spectral characteristics aside from continuous black body spectrum.
The ghosts, while they are also grey bodies as ourselves still are different from us in their thermal nature. I think that it will be safe to assume that they normally stay invisible to us and they ought to absorb more thermal energy from the environment (say, air in the room) to become visible. Do they can control that absorption process, or it happens just naturally? That I don't know: I ought to become a ghost myself to answer that question. Yet, have anyone reported a witness like:
I said to him. "Show yourself” and the ghost of Sir Trelawney had materialized before my eyes.
I’ve never heard of anything like it. This would be a pretty common case with the spirits of air (i.e. demons) who can do shape shifting at will, but not with the ghosts. It looks like the ghost appearance depends mostly on the “weather” than on their will.
In other words: the manifestations happen most of the time accidentally.
And, if the manifestation is merely an accident of environment, then the ghosts in a way are similar to us: i.e. when it is raining we tend to get Wet.
Yet, there are witnesses (and numerous) where ghosts interact with us and it looks like those are totally intentional and controlled interactions. How that comes about?
To be continued
#Ghosts and Spirits; #Metaphysics and Mysticism; #Paranormal and Supernatural