@SpookiLurkr Well, do you know what is the similarity between waves and circles? They represent the same angular motion. And angular speed is the only constant in the movement of any kind of orbit. Even right now you're sitting (or standing, or lying) in an elliptical collision orbit towards Earth. The items thrown up all end in orbit around Earth, to be exact, they change their orbit around the Earth-Moon system.
Why am I writing all this? Because orbital motion is considered a result of space-warping by gravity, and gravity is the one important force Araki mentioned in Stone Ocean. And according to Einstein, an orbit and a straight movement in a line are one and the same.