“Simple pendulums have non-chaotic nature. Controlled Chaos isn’t a true description in the pure physical sense. You need a system like a double pendulum to get chaos. But still a neat demonstration on periodic motion!” [Astromann3108](http://www.reddit.com/user/Astromann3108)
“But if you where to set that up again, you would see the same pattern over and over again. If this was done in a vacuum eventual, you would repeat the pattern over again. The evolution of the pendulum wave is non-random, it follows a apparent pattern. Try doing that to a chaotic system.
If you adjust the initial conditions of a double pendulum by small perturbations, you get totally different results. Here’s a great example of this:” [View](https://www.youtube.com/watch?v=_i3WqnejOQk) – [Astromann3108](http://www.reddit.com/user/Astromann3108)