Oooh, I want a house so I can have one of these. its called an 'energy ball', and if the fact of owning an energy ball isn't enough for you, it's the first approach at making an attractive small scale wind turbine for residential use. It uses air, and compressed liquids, and physics stuff. It looks a little bit modern art, i'd want it to replicate the black iron you get in gardens, and have an added weathervane beneath as they are always useful.
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