This is a visualization of what happens when Pappus's theorem is iterated. Pappus's theorem is a basic theorem in projective geometry, going back to Pappus of Alexandria, an ancient Greek mathematician. The image illustrates the research in the paper Pappus's Theorem and the Modular Group, I.H.E.S. Publications Mathematiques
Motion of a Spinning Top
There are many forms and shapes of spinning tops, and they are put into motion in an interesting variety of ways. Some are spun by snap-twisting a center stem with your fingers and releasing. Others are spun using a cord. Regardless of how the tops are spun, they behave in a similar fashion.