Parkour is a form of urban gymnastics that has gained worldwide popularity over the last few years. Like skating, it involves a refashioning of the human relation to the built environment. Even more than skating, however, this refashioning highlights the capacity of human beings to bring the immensity of urban structures down to the scale of the human body. Check out a remarkable video of this activity here. Note the post-industrial landscape that serves as the backdrop for the performance.