Revolution Doors by Fluxxlab from New York is basically a turbine that's powered by people as they enter or exit a building, just like how water powers a turbine as it rushes through a hydroelectric dam.

Via - Newlaunches

"Taking cues from the idea of how water passes through a turbine and powering it, the Revolution Door boasts a redesigned central core that is capable of converting the motion of a spinning door into electricity efficiently. I wonder just how much in power bills can the building management save each month with this implemented."

Via - Newlaunches

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