This is the central 'well' of the mostly underground Sackler Gallery of asian art at the Smithsonian. More about it here:
http://www.asia.si.edu/exhibitions/current/XuBing.asp
The individual in blue added an unexpected touch of mystery to the moment.... perhaps this was a murder victim and we had been miraculously transported into the first teaser segment of a TV show. We scream and then it cuts to the coroner examining the body as the detectives all hover over and make witty remarks? But no.... she was just pruning the vines.