Ye olde history of perpetual motion machines

Disclaimer: The “gravity engine” is not something I have studied, and the builders do not claim it is a perpetual motion machine (it’s said to draw power from the moving mass of the earth, like hydro turbines and windmills do, which is not exactly the same thing.) I was just struck by the similarity of appearance with some of the historical devices and thought y’all would like to see it!