(Youtube.com version if you are outside China)
This is a time-lapse of a 15-story Ark Hotel in 长沙 (Changsa) being built; 48 hours for the basic structure and another 90 hours for the walls and windows. It can withstand a Richter scale 9 earth quake. It was built using 6x less materials than a similar building. More details here.
Chinese leaders often talk about a new “growth pattern” for China. For me, this is an example of what they are talking about. China must develop and raise the population’s standards of living and at the same time use dramatically less energy and materials. They want to do this fast. For a country and population of her size, it is hard to imagine the scale for which this is taking place. And here we are, a 15-story building quietly goes up in all but few days. (Thanks rolf for the pointer to this development.)