Algodoo

I hate to be the one to break the news to you, but this is not "perpetual motion". First of all, perpetual motion is physically impossible and therefore it does not exist. Secondly, these rotating circles are spinning with very little friction or other forces that would make them slow down and stop, but the fact is, they WILL eventually slow down and stop. It just takes a long time for that to happen. So, the bottom line is, they "appear" to be running under some form of perpetual motion, but that is nothing more than an illusion. The circles are actually slowing down at a very slow rate, and eventually they will stop!