This phenomenon[1] which you can use to find the center of gravity of an object might greatly increase the number of stones that work. [1] https://www.explorat

This phenomenon[1] which you can use to find the center of gravity of an object might greatly increase the number of stones that work. [1] https://www.exploratorium.edu/snacks/center-gravity https://www.exploratorium.edu/snacks/center-gravity