This toy designer was a genius: A wind-up toy that detects edges purely mechanically! Human intelligence beats Artificial Intelligence. Edit: Minor typo corrected.
A wind-up robot with two back wheels, two cone-shaped front wheels on a rocker and a perpendicular wheel in the middle. The video shows the robot driving on a book and turning around at the edges.
At edges one of the front wheels falls over the edge which engages the perpendicular wheel which turns the robot until the front wheel gets moved up and the robot drives away from the edge.
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