Lead architect of the Danish pavilion, Bjarke Ingels, rides a bicycle on its roof at the site of the World Expo 2010 in Shanghai on April 25, 2010. The Danish pavilion was inaugurated with Expo organisers giving members of the public a preview of the largest-ever World’s Fair as they tested facilities and public transportation before the official start on May 1. AFP PHOTO/PHILIPPE LOPEZ (Photo credit should read PHILIPPE LOPEZ/AFP/Getty Images)