I posted a while back about ghost photographs- where you can see the background through a person, as if the person has faded away.
Here I happened across one!
Here is a link to the photo, and you can scroll in...
http://www.liverpoolmuseums.org.uk/conservation/exhibitions/metropolis/construction/cathedral_zoom/index.aspx?id=6...to see this:
http://blog.liverpoolmuseums.org.uk/graphics/stewart_bale_legs.jpg Now, in this one it is likely that the person was walking by when the photo was taken. But I remember seeing portrait type photos where part of, or an entire person was fading away. Brilliant!