Particle Robot
One Particle Connect with Other to move like a Swarm
Screenshots

Hunter's comment
Well, This partical robot was developed by some Researcher of MIT & Harvard the best thing about this Robot is as its name says partical it has same mechanism. The small small robot have ability to connect with each other magnetically move or work together like swarm as you can see in the video.
Link
http://news.mit.edu/2019/particle-robot-cluster-simple-units-0320

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