They are better known as shadow people. It is very rare to actually get one of them on film, for they are indoor dwellers. however, i do happen to have a couple of photos of such spirits. These particular spirits aren't good ones this much u can be assured of. They are visable to the eye, but usually noticed from the corners of your eyes(field of vision), lurking n the hallways of ur homes.It's common to be touched by them, an you can feel it. Usually a dwelling that has these types of spirits n them, have things go wrong with thier living inhabitants, such as, a marriage breakdown, money poblems, ect; thy are a very negative force, and are earthbound for whatever reasons.To rid your home of such spirits can be tricky.
I've seen a shadow person once head on, well at least not in the corner of my eye, i was in 8th grade so it was 1992, we were on our overnight trip to washington d.c. this was the first day because i remember the night at the hotel discussing my ideas about afterlife and ghosts and dimensions, brought up because of my experience earlier that day. we were at the vietnam memorial wall and i saw this person walking on top of the wall, it could of been very normal if maybe there was higher ground behind it, which there turned out to be, but the thing that didn't connect right away with my brain was that he was pitch black, and he disapeared into the ground, behind the wall, kinda like going down a staircase. i was able to figure out that behind the wall was land leveled up to the top of the wall, but no downward slope. recently i listened to an art bell shadow people show i downloaded and some other peolple mentioned the same thing about the "person" going into the ground. it was probly my only true supernatural experience and i am proud of it. i recently talked to a girl who says she's had some experiences with shadow people as well, hopefully i can find out more of what she knows. just wanted to share it and to let people know that the phenomanom exists whether its something that the human mind creates or a non-physical living creature. contact me if you want to talk shadow people. ratkenrat@aol.com