Architect Renzo Piano says cities have ignored suburbs at their peril. “The big topic of today, and of the next 20 years, will be peripheries. How you can transform peripheries into a town. What is happening today in Paris is happening everywhere. It is mad, mad, and the insensitivity of people and politicians . . . They create ghettos. In Paris it is particularly bad. Now people are starting to understand that the real challenge of the next 30 years is to turn peripheries into cities. The peripheries are the cities that will be. Or not. Or will never be.”