Dutch artist Theo Jansen has been working on his Strandbeests, kinetic sculptures capable of locomotion, since the 1990s. As part of their development he's devised wheel-free ways for them to move, like these gear-driven "legs:"
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Other artists and creators like Jansen's countryman Janno Smits took note of the former's developments, creating animations like this to deconstruct how they work:
Last year a Jacksonville-based artist named Ron Schroer built a similar movement mechanism to drive his Boneshaker Bigwheel bicycle:
Izzy Swan, too, was bitten by the gear-driven-legs bug. And, Swan being Swan, he of course made his variant powered by a 20-volt drill.