Yet another male mourner, only his whitened face and white collar separating him from the dark, just as the square white frame of the picture separates it from the darkness which is the place at the back of every picture. Above his head is a reversed "C" of light. his head dots the question mark.     Each Sunday, ghosts would appear at a seance in Tavistock Square, to be photographed with the living by Ella and her special camera.