Ghosts are not all that spooky and supernatural, we see ghosts every day. Ghost are humans that live not in their own time; they are beings who seem to be right next to us from the outside, but are absent on the inside. We all become ghosts from time to time. The more our thoughts are dedicated to the future or to the past, the more absent we are in present. And all that's left behind is just an unresponsive body, just a physical form.