Every year about 109 million bicycles are produced, and 140 million people are born. That adds up to lots of extra bikes to make art with. Burning Man Festival 2007 by Mark Grieve and Ilana SpectorBikes reclaimed from garbage dumps and recycling centers form a 30 foot high archway.Pic: Jenene Chesbrough www.flickr.com Bicycle Shop GermanyChristian