Skyscrapers in Los Angeles are visible behind a dome of Exxopolis, an inflatable walk-in luminarium at Grand Park in Los Angeles, California, September 7, 2013. The inflatable walk-in luminarium, designed by Architects of Air, creates a maze of winding paths and domes featuring Islamic architecture, Archimedean solids, and Gothic cathedral designs. Picture taken September 7, 2013. REUTERS/Jonathan Alcorn (UNITED STATES - Tags: SOCIETY)