I was in the city with my camera a couple of weeks ago when I encountered this guy. He had four cameras mounted on a contraption which he had strapped to his back like a backpack. Each of the cameras pointed in a different direction like the main points of a compass and their shutters were attached to a single cable release. Every few paces, he would fire the cable release taking 4 synchronised pictures of his surroundings. He works for an online mapping organisation.