Two-pole balancing (2009): https://www.youtube.com/watch?v=fqk2Ve0C8Qs https://www.youtube.com/watch?v=fqk2Ve0C8Qs Double inverted pendulum balancing (2015),

Two-pole balancing (2009): https://www.youtube.com/watch?v=fqk2Ve0C8Qs https://www.youtube.com/watch?v=fqk2Ve0C8Qs Double inverted pendulum balancing (2015), a much harder task: https://www.youtube.com/watch?v=8t3i2WPpIDY https://www.youtube.com/watch?v=8t3i2WPpIDY Double inverted pendulum balancing with a physical cart (2011), a much much harder task: https://www.youtube.com/watch?v=B6vr1x6KDaY https://www.youtube.com/watch?v=B6vr1x6KDaY Triple!!! inverted pendulum balancing with a physical cart (2011), a much much much harder task: https://www.youtube.com/watch?v=cyN-CRNrb3E https://www.youtube.com/watch?v=cyN-CRNrb3E