I should have remembered, that if there was anyone who could do the trick with the hand, it would be you! Too bad, sean-king wasn't there to take a picture, when you did your experiment.
Again, you put it all in such beautiful words. I like your comparison with the music box and the mechanical parts would point in such a direction as well. You describe the ballerina's appearance on stage exactly the way I thought of it!
Is it all the result of her doing? I deliberately left it open, who's hand it really is... hers in a wild and sort of contorted position? Or just the person moving a handle in the background... I think there are many for it all to work.
❤️