The municipality in Shanghai seems to be fond of various “gadgets”, for example many roads in the city have electronic signs displaying a colored map of the streets in the area - the ones with traffic jams displayed in red, the one without traffic jams in green. On this short visit to Shanghai, though, I’ve seen something new (to me): some public places have “noise meters”, large billboards which display the current amount of noise outside. It’s really cute but I am still trying to figure out what its practical purpose is…