They used a lot of this:
to make this:
It seems amazing at first that these two guys (twins, no less!) Doug and Mike Starn, could make a structure that groups of people can walk in using only bamboo and bungee cords. But having lived in HK and China, to me it's amazing that two white guys did it. In Asia, buildings are demolished and reconstructed within a matter of days, and they don't waste time on the scaffolding. Once a small base is built, they send a guy up there with bamboo and some cable ties and he straps a few on, climbs up them, and repeats. For about 10 stories. It's amazing!