'Anti-collision' system, as demonstrated in this YouTube video

The following keyboard shortcuts are available

• E toggle v-sync. V-sync limits the number of frames per second, so disabling it speeds up the simulation.
• A toggle the visibility of the traces.
• space toggle slow-motion.
• R reset the view.
• esc close the application.

You can zoom into the simulation by scrolling, and move around by dragging with the mouse.