Like this? https://news.climate.columbia.edu/2010/07/01/the-playpump-what-went-wrong/ https://news.climate.columbia.edu/2010/07/01/the-playpump-wh... Using a

Like this? https://news.climate.columbia.edu/2010/07/01/the-playpump-what-went-wrong/ https://news.climate.columbia.edu/2010/07/01/the-playpump-wh... Using a wheel to harness the power of people has been around for a while but often does not end well (see Arnold in the opening sequence of Conan). There was also a soccer ball generator. Kids had to be forced to "play" with that one too.