The Argentinian artist Tomas Saraceno has been wowing audiences with his futuristic mega-sculptures for years (see: the Metropolitan Museum's awesome "Cloud City" installation). With "Solar Bell," Saraceno wanted to design a prototype of a solar-powered, flying office building. You know how sometimes people just drift off at work? Saraceno literally imagines the future of architecture that way. Photo courtesy of Bart Maat/Taak.