In this simple animation I used alot of flat surfaces to see how the light would reflect. I improved the Light Tracking feature by not only tying it to the object it also uses a point in space (davey's super point script) as a reference so that it stays a fixed distance from the object but at a changing angle. In this animation I used the Big Sphere as the Point reference, so we can think of it as the direction the light is coming from. As the small sphere travels around it slowly becomes between us and the light, finally eclipsing it.
Thanks for viewing!