High school ghost caught on Camera

The ghost of a child has been caught on a motion detection camera at a Ashfield High.  It happened during the early hours of night time at around 1:50am.  The ghosts appears in a black transparent shadow and looks like it was walking around.  The shadow appears to be walking on the walls, then to the center of the hall.  What is so extrodinary about the recording was the ghost appear to have shadows from the lighting on the hall.