The Revolution Door concept from Fluxxlab adds a power harnessing component to a standard revolving door to create energy as people walk through the door and turn the gears. While it is a good idea in theory, if it adds any additional resistance to the door it will make it even more difficult for some people to push the door. In a heavily traffic’ed doorway this could be very useful.
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Energy can not be created or destroyed
so surely it just enduces the use of it?