The balletic side of 'Black Swan' [video]

With "Black Swan" already one of the most buzzed-about -- and polarizing -- art-house films to come around in a long while, we got our hands on a snippet that shows some of what happened behind the scenes during the film's production. The video won't reveal much about the plot of the supernatural drama. But it will give a sense of how much effort director Darren Aronofsky and star Natalie Portman put in to making the athletic and visceral aspects of live dance convincing on the screen.