The Wooster Collective recently featured video of a piece of street scultpure by Joshua Allen Harris. It could be describe as kinetic pneumatic art, and features an inanimate pile of material attached to a subway grate. When a train passes in the tunnel beneath the grate, the upward flow of displaced air fills the material and produces a medium-sized bear. The continued flow of air makes it appear as if the bear is actually animated, like it's shaking off some arctic water. When the train is gone, the bear retreats to its former state of hibernation, waiting for the next train so it can rise again.