My first experiment in Unity3d. The pendulum lengths are in ratios to each other so that it takes 40 "ticks" of the longest pendulum for everything to be back in sync again. Along the way there are several intriguing patterns, including a double, triple, and even a quadruple helix if you look closely. Inspired by various real-world videos of the same effect, but it was much faster for me to build it this way. :) Kudos to Unity's physics engine for keeping everything in sync.