The balancing act is very interesting. In my opinion: In a one-dimensional frame, a force and a counter force can balance if they are equal, and the body will remain stationary. But in a two dimensional frame, three forces will be required to keep it stationary. With only two forces, the body will be having a circular motion, and forces will remain balanced. And, in a three dimensional frame, a body will require four forces to remain stationary, and three forces to remain moving around on a spherical surface.