New York-based artist Joshua Harris makes movable sculptural artwork out of plastic bags, harnessing the air from subway grates to give them a sense of life.

Having only been introduced to "street art" as graffiti, I'm pleased to see it take shape in other forms. And while Joshua Harris is not new to this arena I was just introduced to him today. It was like a little Christmas present when I got a chance to see the mind of an artist working with non-traditional materials and even furthering the its kinetic effect using the man-made waste energy of wind from subway trains passing through surface level street vents. Amazing.