This video is insane. Created in 1990, it's called the Pedestrian Project by artist Yvette Helin. It involves performers wearing entirely black custom-made costumes modeled after the generic images of men, women, and children. The kind you see on public signs but come to life.
These performers mimick the lives of everyday people and, of course, the public can't stop to notice to them.
She explains it thusly: The Project remains active since 1990 and recently made an appearance in Williamsburg, Brooklyn, to help promote "Williamsburg Walks", an event which closed the streets for Pedestrians to use instead of cars during specified hours on the weekends.
For more information, check out yvettehelin.com.