Looks like they place dots around the edges of the screen (randomly) when the document is first committed. Then the physics model pulls in with some linear (to

Looks like they place dots around the edges of the screen (randomly) when the document is first committed. Then the physics model pulls in with some linear (to distance) force to developers that have committed to it. Developers repulse everything at a force square to the distance of the object, so that documents find equilibrium at a ring.