Self-assembling machines

[Kanis]

The M-TRAN II robot, developed by the Japanese Distributed Systems Design Research Group, is made up of a dozen of modules. Each contains two blocks linked to each other. Each block can rotate 180 degrees around the link that connects it to its mate, and each module contains a magnet that can be switched on and off, enabling it to connect to other modules in the system.
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Thought this was interesting