Walking at night with the empty city is a delight, it is a pleasure to guess subtleties on that small screen, let them sleep, and check in the morning that it was worth it. Ghosts love to be photographed, they sneak into the frame and wander back and forth, they know that the sensor sees them and that the pixels will make them appear for us. Because that's the fun of it, when you take the picture you just feel they are there.