The video of the Boing Ball: https://www.youtube.com/watch?v=-ga41edXw3A&t=26s https://www.youtube.com/watch?v=-ga41edXw3A&t=26s I remember what were the effe

The video of the Boing Ball: https://www.youtube.com/watch?v=-ga41edXw3A&t=26s https://www.youtube.com/watch?v=-ga41edXw3A&t=26s I remember what were the effective limits at these times and to me it still looks impressive. As an example, the observer would never get the idea that it's done by changing "the beginning of the screen" as the grid background stays on the same place all the time, and just the ball (with the shadow) moves. Also note the change of the rotation direction as the ball hits the wall.