It's extremely hard at human scale. I worked on building human-sized walking robots, initially with hand controls, and I couldn't learn the eye-hand coordinatio

It's extremely hard at human scale. I worked on building human-sized walking robots, initially with hand controls, and I couldn't learn the eye-hand coordination needed to make it balance. Juggling is similar to walking in terms of speed and complexity of feedback. However, the fact that it's so large means the time constants are longer. At 10x bigger than a human, each juggle should take sqrt(10) as long. So maybe it's possible to do with entirely visual feedback.