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That shouldn't be too crazy to accomplish with a bunch of tiny cable driven actuators hidden down in the torso to keep it compact.

Funnily enough, a quick search on cable driven actuators for animatronics leads you to another paper by Disney Research. https://www.youtube.com/watch?v=MARwhwXEVz8

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Not too crazy to accomplish... mmm maybe a typical scientist attitude imho. Professionals who draw even just static portraits will likely tell you otherwise. With that stuff they will look like botox robot zombies for years :-D ...we will see..

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