The site of Expo 2010 Shanghai China is in the middle of its transition from a land of makebelieve to a key new area of the city. Of the 145 buildings that made up the expo, only fi ve were built to be permanent. 1 Yet three years after the world’s fair, 99 temporary buildings remain. Some continue to promote the countries that built them. Others have been converted into theaters, museums, and theme parks. Still others stand fi rm but empty, awaiting reuse or demolition.