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This screensaver was created in virtual reality, using VRML. It is made up of rotating pinwheel stars of various sizes. Also, it is correct in terms of physics. When a small star collides with a larger star, they each bounce off in different directions based on the angle they collided at, and change speeds based on size. I think of it as being similar to watching fish in an aquarium. If you watch it long enough, it tends to decrease stress. At least, it does for me. Try it out!