Wang Dan: I’ve by now lived in each of China’s main megaregions. It is time to make assessments.

I’ve by now lived in each of China’s main megaregions. It is time to make assessments.Everything that can go wrong in urban design has gone wrong in Beijing. The climate is arid and prone to northerly sandstorms. Its streets are unwalkable, but a stroll would reveal that its imperial heritage, made up of alley houses called hutongs, is slowly being taken over by its socialist heritage, made up of