Inverted Pendulum from Tensor on Vimeo.
This looks like it would make a great desk toy if it would work at a smaller scale, and if it's robust enough, it would be a hell of a cat distracter.
The music is "Mathar" by the Dave Pike Set-- energetic sitar accompanied by (rock?) drumming. I recommend the music even if you aren't interested in chaotic inverted pendula.
Link thanks to Geek Press
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