This display shows a system of ten particles, randomly positioned near the the point (5,0,0) of the reference frame. The initial view we have is looking straight down the z axis at the (x,y) plane. You may alter the pitch and yaw angles to get different perspectives. The center of mass of this system of particles is again marked by the larger dark spot. The display represents a snapshot of a system rotating around the z axis. Click the Action button to start the rotation. The center of mass reference frame is marked by some short axes.