History has certainly shown our ability as humans to build astounding structures with a lot of hard work and a little blood, sweat, and tears. In the last century we’ve been able to combine that hard work with incredible technologies and accomplish things beyond our wildest dreams. Recently, in Changsha, China workers were able to construct a 15 story sustainable hotel – The Ark Hotel – in just 6 days. It was reportedly built extremely efficiently with optimal energy, material and time savings and produced only 1% construction waste. The time lapse video shows how they achieved this working around the clock.