this guy makes wild projects and a lot of them would fit into permaculture, like a water pumps that use the energy in a stream to pump water further
but he also makes some crazy cool stuff, like an exoskeleton that is pretty much steampunk, using winches and cables and kind of looks like a death trap, i think he put a steam engine in a pickup truck? he turned his septic drain field into a capacitor bank. his projects range from "why would you even do that" to "how did you get that to work?" to "please don't die". he's like the terry a. davis of backyard projects
anyway i only found this while looking for info on Trompe air compressors which are passive, have no moving parts, and use a falling stream to compress (and cool!) air.