[Photo courtesy of Zach Klein/flickr]
So, this appears to be a wind power device to catch some of the gusts coming off the East River at the foot of Grand Street in Williamsburg, which is a very windblown place. What's unclear is how much power this absurdist windmill generates and what it runs. It appears to be made of, you know, fans.
· Mini-Windfarm on My Building Roof [Zach Klein/flickr]