There are plenty of things that self center despite not having active mechanics in the sense we are talking about. Bobbleheads, an egg that you shake to have th

There are plenty of things that self center despite not having active mechanics in the sense we are talking about. Bobbleheads, an egg that you shake to have the yolk hold it in place, a lot of springy stuff in general. Obviously there’s a mechanical force at play, but there’s a huge difference between “some springs make this work” and “these motors make it work”