The guy in these images is called John-Paul Zaccarini. He was performing in the classical heritage tent at the London Mela festival, August 2008. His website is Company FZ. In case it's not obvious from the pictures, he's hanging from a rope suspended from the roof of the tent and using nothing but his own strength to manipulate himself into some funky positions. In the first 3 shots he still has his feet on the ground.