These just keep getting better.
The making of tiny working models of piston engines is not the most popular hobby in the world. The time, dedication and enormous skill required give it a pretty limited appeal. But the results can be appreciated on a much wider scale, and the work of Yesus Wilder has been consistently incredible. His most recent creation is a W32 engine, the only one of its type that we know to exist. It displaces just 47.5cc and actually runs, albeit using compressed air.
The 850-piece creation took a staggering 2,520 hours to complete, but it's all worth it, as it is absolutely mesmerizing to watch.