I'm sure you've seen the Spencer Tunick en masse nude photography before. He travels around the world and gets hundreds of people to pose naked in the center of some world city or another. Here, Tunick visits Amsterdam and poses naked people on bikes. A classic!
Especially since his photos have been getting boring recently. Nothing changes from one city to another, except the scenery. Add the quintessential component that makes that city great and you've reinvigorated the genre.