All controlled by one computer, tracking each quad rotor with high speed cameras and apparently doing 600 calculations a second to make it happen. Bit scary too, if you use your imagination a little...
Indeed - many with a very cynical viewpoint, though I don't disagree. Work out how to get them to work together but independently with on board intelligence, miniaturise them and you have the perfect spy and weapon in one... However, with the number of cameras in the world, the principles could be applied more beneficially to mass individual transport, logistics networks, street cleaning and maintenance, and the list goes on. It is really just about computing power and control programmes. I love it I think, like sars