While you stare and wonder at the great ghostly substances you have paid to see, that are streaming around the fan and the lightbulbs, your partner is staring at you in a somewhat unseemly manner, halfway between repulsion and attraction. That's because someone is coming out of your nose, without your permission (and that's ok, you didn't even know it was happening until just now).     Each Sunday, ghosts would appear at a seance in Tavistock Square, to be photographed with the living by Ella and her special camera.