When I was a teenager, I used to construct robots from LEGO bricks, and my flagship project was a hand, movable at the wrist and with moving fingers. I could grasp a ball or a bottle with it, but I had problems controlling the motors and the precision of the movements. Those were the days of TTL digital circuits, not Arduino kits. However, there was something fascinating and at the same time very mysterious about copying nature, even with blocks.
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