I saw a few works made by Arthur Ganson recently, at the MIT museum. The flapping one above was there, slowly churning the air. Of course, you can see how marvelous they are, and maybe you have even seen them in person. They struck me as self-assured, and delightfully modest. They aren't terribly loud, or showy, they just seem to bumble along like clockwork, like old machinery, or a mill wheel. They really are just right, and I hope you spend some time on his website, watching the time flow.
Here is a song to go with the first film, and please also look at this wonderful one: