Well this is my first idea for an SCP. From what I have gathered there doesn't appear to be any objects like this so far, but then again I will admit that I have yet to read all current SCPs. I am interested in gathering what those more experienced in such matters have to say before I decide to invest more time working on this idea.
The Soul Platform (just a working title for the moment) is a 1 meter by 1 meter set of granite tiles with a depth of .1 meters. The tile is in a black and white checkerboard pattern, two .5 meter by .5 meter black tiles and two white tiles of identical dimensions. At the center of the four component tiles is a dark blue crystal hemisphere with a radius of .05 meters. The hemisphere can be pressed into the tile like a button, after which point it glows faintly. Light sources in the room then dim and the temperature drops to about 5 degrees Celsius.
5 minutes later a figure will appear upon the tile. This figure is vaguely transparent and appears to be someone from a point in Earth's past. The figure is random each time and is never the same for any consecutive activation. The figure is aware of its surroundings and can speak and move about provided it is within a 10 meter radius from the platform's center. It walks on the ground as a normal human, but essentially is acts like a hologram.
The specter speaks in the language it knew in life and is often confused about its surroundings. Those who appear to be from the distant past are often hostile toward others, and may attempt to do others harm despite its inability to interact with solid matter. It can be interviewed and if asked will often reveal details about its life such as its name, occupation, etc. It will often reveal details about events that could only be witnessed firsthand, however any attempts to find records of the person's existence turn up empty.
After a seemingly random amount of time, the subject violently flings back to the center of the platform. There the subject will fall into somewhat of a trance as it appears to reenact the actions it took before its death, culminating in a graphic depiction of how it died (people hanged appear to dangle off the ground with the image of a noose around their neck, people shot fall to ground with bullet holes in them, etc.) The apparition then disappears as the lights are restored to the room and the temperature returns to normal levels.
The tiles and hemisphere are not connected and can be separated, but fling back together at high velocity and lock back into place at a central point once they are no longer in human hands. The granite tiles and hemisphere cannot be broken with brute force either.
I was thinking that this would be an object found within an old estate in either Europe or the Northeastern US.
The SCP would most likely include a list of the various apparitions that appeared during each use of the platform to date.
Since this object would most likely be classified as SAFE I imagine that its containment procedures would be very minor, and that it would be placed at a low security facility.
My original plans were that the apparitions so far have yet to appear from prior to the Renaissance or later than the 1940's.
So there you have it. What are your opinions?