Let's take for example a colourblind human with one eye (yeah i know, just work with me) theoretically, the human has absolutely no perception of the base colours (yellow, red, indigo). At the same time, he has a lot of trouble finiding the texture depth of shadows, different shades and also rough edges (ie: fluffy robes, velvet) or smooth textures (ie; silk, polyester), whether they are the same colour or not. So this mean that the human can look at a silk pair of indigo pj's, then glance at the same type of pj's beside it, velvet in texture; yellow in colour. See it from his point of view. The "physical" form would be two pairs of pj's side by side, probably black and white (I'm not colour blind, i don't know what it's like, but lets look at it that way) with different shades accenting the fuzz on the velvet and the stale flat colour of the smooth silk. Now take ghosts and the human at the same time, place them face to face. because I have no idea how ghosts see or enough about them to make the relation, let's work with the human. The human, on average, based on study, uses simply ten percent of the brain. Is it the same when he's colour blind and has the use of one eye? Suppose he had perfect vision, actually let's give him three eyes. Could it be the third eye would contrast all the shades he misses by having only one eye and make up for the colours he has never seen before? Its true, we only use ten percent of the brain itself, maybe its just our perception. Theoretically, if we used 100% of the brain, wouldn't we be able to see more? Or do we refuse to accept they exist just cuz two eyes aren't enough to see them and yet we can feel them all around us when we're alone in the dark? Should we tell science too cool it with making every last soul dependant on records? Think about it. People have seen them. I see them. You handle the records, no matter how human we both are, no matter how scientifically matched we are, no matter how far science breaks things down, we are the same, created the same for the same chances to make the same mistakes to learn the same principles. But we see things differently. So are they there or did I spent 20 minutes of my high blabbing on an on about a theory I achieved by smoking a joint, another creation of nature like me? I don't know. I just wanted to see how it'd turn out. Whaddya think? I think I just surprised myself lol