Pondering only a tad. A circle is a mystery. One perspective shares a line from point A to Point B. Another shares it is an oblong stretched, yet the math says, "How dare you." A twist along that point of A to B, add thrust, with acceleration soon a sphere and too a particle diffuser or something like that. Add a click type nudge with a finger and motion becomes while direction is odd traveling along a plane of sight.
Suddenly, by adding the imagination that spinning sphere, a line too, a circle always, is motionless standing still in space. Odd not even, the camera pulls back and discovery shares direction with attraction between masses.
Soon, well ponder the cinema release Tommy (1975) and the Pin Ball Wizard performed by 'The Who' in front of a theatre while filming a bouncing ball guided by a deaf, dumb, and blind person. It all began as a circle too. For more visit http://en.wikipedia.org/wiki/Pinball_Wizard Maybe a hub is in there somewhere?