I go through this tunnel every day on the way to work, when I’m not driving I usually try and take some pictures. Invariably they turn out awful as there is no light and the road is quite bumpy. This is one of the few that turned out reasonably successful.
A Perpetual Motion Machine of the Third Kind is a device which has a component that can keep moving forever. An example is a superconducting ring in which an electric current can flow indefinitely once started. Other examples are the planets and stars that move throughout the universe and will continue to move until they are stopped by some natural cause. This kind of device is clearly not impossible.
