Aside from its inability to deal with corners, this might be the cheapest and most ingenious robot we've ever seen.
Where more expensive robotic lawn mowers concern themselves with advanced sensors and AI driving, this one uses nothing but a rope and a stake in the ground.
As the rope tightens, the circular path of the mower grows smaller, cutting all of the lawn within the reach of the initial radius.
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Take a look at how it works: