> perpetual motion machine to me Yeah, but it's a perpetual motion machine in the same sense that everything is; all particles evolve in time, i.e. the values

> perpetual motion machine to me Yeah, but it's a perpetual motion machine in the same sense that everything is; all particles evolve in time, i.e. the values of all six quantum fields change ceaselessly. The controversial (imaginary) perpetual motion machine is one that you can extract unlimited amounts of energy from. Which is really funny to me, since energy is essentially defined as the constant that does not change in time (well, excluding general relativity).