Well I do, and, well...
So let's say there is the seen world, and there is the unseen world, and there is a reason why we, imperfect souls can't see everything in the unseen world...
There is that thin line between the two, and when it breaks inside somebody that is insanity with fuckin weird hallucinations and stuff like that, but there are also people who naturally have the ability more than the others (as everybody has it, just for some it just happens, such stuff is learnable anyway), they are considered to be the shamans, mediums between the seen and unseen world, to help people... (Though you can't just become a shaman in an eyeblink, one has to learn a lot to become a real shaman...) The effects of psychedelic drugs, aka hallucinations and stuff like that are also to reveal some things of the unseen world, by chemically bugging your system so it changes for a few under the drugs... (That's why in countless cultures drugs have been being used forever, especially by shamans...)
So I just wanted to drop this in before anyone thinks am nuts, I do have had ghost experiences in quite several times years ago, for the few first times it was equal with sheer terror for me, but after a while I got used to it, it was still freaky as hell though... Then I got fed up because looks like I couldn't communicate with the spirit visiting me like it would have been ideal, so I just asked him not to visit me anymore, and indeed, nothing similar has happened ever since... (It is said that the first spirit who visits the possible shaman is the "calling spirit", to call the shaman to do his/her duty of that nature - there is a wee bit of mental imbalance in my family, I guess I inherited some of it, but at least I never considered it to be mental illness, rather that I am "special", because indeed, I have quite the sensitivity when it comes to stuff like that, energies, divination, seeing and feeling people, and what not... Don't wanna sound bigheaded as if I was bragging, though it's still better probably than to sound like an idiot... ~lol
^^ ~lays ears blushy)
So anyway, I strongly believe that souls are all over, like in the Bosch pictures, and it is a blessing that one can't see them all, people tend to think that there is nothing at all anywhere inside and around them, but them and their selfish little things, whereas everything is built up of energy, even the hardest materials - if you do some research about physics and quantum mechanics then you will find info about it!
So souls are souls, spirits are souls, ghosts are souls, we are souls, the fact that it is mostly unseen doesn't mean it doesn't exist - just ask a little creature living in the deepest levels of the ocean, what would that lil one say if you said "well yep, there is the sun, it's everywhere and you can always see it for half of the day" of course it would say "that is total bullshit, what a delusional guy, saying such ridiculous and funny things!"