The terms we use for what is considered supernatural are woefully inadequate. Beyond such terms as ghost, specter, poltergeist, angel, devil, or spirit, might there not be something more our purposeful blindness has prevented us from understanding?
We accept the fact that there may be other worlds out in space, but might there not be other worlds here? Other worlds, in other dimensions, coexistent with this? If there are other worlds parallel to ours, are all the doors closed? Or does one, here or there, stand ajar?