The double pendulum is the posterchild of chaotic systems, so balancing a triple pendulum so easily belies the complexity of the underlying physics. The balancing act is achieved using a motorized cart regulated via a constrained feedforward controller. So while it might be difficult to predict the behavior of a triple pendulum, controlling it with a feedback loop is relatively simple.
Source: https://youtu.be/cyN-CRNrb3E
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