Positive feedback loops cause small displacements from equilibrium to grow exponentially, often with catastrophic effects. This demonstration with a sound system is just one example. This topic is especially relevant today to the understanding of how "climate change" can become "climate catastrophe." ... https://www.youtube.com/watch?v=BzqitY3nC7A

Graphing circles ... https://www.youtube.com/watch?v=905Qzccx8xM

Graphing Polynomials ... https://www.youtube.com/watch?v=7Oxz6etdvPI

3-D demonstration of the motions of the sun and moon in the sky, created using Visual Python (VPython). [By the way, given the number of clueless comments, it seems I must point out, this simulation HAS ABSOLUTELY NOTHING TO DO WITH THE MIND NUMBINGLY LUNATIC FLAT EARTH "THEORY" NONSENSE!!! (Don't waste my time.) This is about the apparent sky for a localized observer: a phenomenological perspective one has for observational astronomy or navigation. (Go outside and look up!) When you stand on the ground and see a few hundred yards, the earth appears locally flat. You lack depth perception for cosmic distances because your eyes are close together compared to the distances involved. That's why the sun, moon, and stars appear to be at the same distance. When everything in the cosmos appears the same distance away, it gives the illusion that they all lie on a sphere centered on the observer. Hence the sphere of the sky is an illusion. This simulation is about understanding this localized perspective.] ... https://www.youtube.com/watch?v=5k--My8fnes