Double Pendulum on a Cart

N1 designers did not have good computers. Chaotic behavior does not mean that system is impossible to control (e.g. double pendulum ▶ this video ).

Two-pole balancing (2009): link Double inverted pendulum balancing (2015), a much harder task: link Double inverted pendulum balancing with a physical cart (2011), a much much harder task: ▶ this video Triple!!! inverted pendulum balancing with a physical cart (2011), a much much much harder task: link

Cool. Feature request: mount the pivot on a programmable cart. It'd be fun to write software to balance the double pendulum. e.g. ▶ this video and, balancing a triple pendulum: link