I can see how it works in 2D, with things bouncing into the air where there is no resistence, but how is that supposed to work in a 3D field? Wouldn't any movem

I can see how it works in 2D, with things bouncing into the air where there is no resistence, but how is that supposed to work in a 3D field? Wouldn't any movement push the particle up against a barrier that would force it back into the center?