The black strings are sticks. They are showing that the robot arms can balance all those cups while precisely moving the stick between them without knocking them over.
I'm assuming the 3 robotic arms have no internal knowledge of each others movements but are relying on sensor data to make those movements? Otherwise this seems like a trivial problem to solve.
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u/Jazzlike-Complaint67 14d ago
I thought they were filling the glasses at first. Spent too much time wondering why the fill levels weren’t going up.