You Spin Me Right Round Baby Right Round

From electro^plankton:

I'm getting dizzy just thinking about this. The Windscraper by architect David Fisher is a tower based around a concrete center core. Each floor sits on its own ring and can independently rotate with some wind assistance. The combined turning motion of each floor is enough to power the entire building and 10 other similarly sized ones. I'm not sure how this would affect people inside but if I remember correctly, if an object is massive enough and slow enough, you can't feel it moving.