No it's not Photoshopped. And no, it's not twins. (And no, they are not ghosts...although they are transparent).
Here's how I took this shot: Position the subject on one side. Set camera on tripod with 30 second shutter speed. Press shutter. You have 30 seconds to do the rest, which is to turn out the lights (it needs to be night time or at least completely dark when the lights are out). Subject then moves to the second position. Turn the lights back on. The camera captures everything that it can see during the 30 seconds, which is two of the same subject!!! Cool huh?
Of course the camera can only see him when the lights are on. It's also why he looks see through, because the camera has also captured the wall each time the light was on, so it is showing both subject and background in the shot. Great fun!