Design by chocorange [via] Beijing is perhaps the largest construction zone in history, with thousands of new projects under way. Once a flat cityscape dominated by the imperial Forbidden City and monumental but drab public buildings, Beijing has been struck by skyscraper fever. Over the past 30 years, China’s economy has averaged nearly 10 percent annual GDP growth, driven by the marriage of world-class technology with a vast low-cost workforce. That same dynamic has turned China into an architects’ playground, first in Shanghai in the 1990s as its skyline filled in with high-rise marvels, and now in Beijing, which is building at a mad pace in preparation for the 2008 Summer Olympic Games in August. Beijing’s newest buildings push aesthetic and technological bounds, each…