Still not sure, could be advertising or for real... dunno Found some more stuff: Discussion: http://blogs.discovermagazine.com/intersection/2009/08/08/ok-sciencefans-real-or-fake/ Link to his site: http://www.projektbuero-kammerl.com/index.html Earlier testing: [youtube]http://www.youtube.com/watch?v=_GvaDOwk_ik[/youtube] Explanation how it could have been done: http://www.juicetheblog.com/2009/08/05/unbelievable-waterslide-compositing-walkthrough/ Real or Fake? We probably never know for sure. Anyway, its fun to watch