When Richard Florida coined the term “creative class” in 2002, he painted a very clear picture for urban revitalization. His book The Rise Of The Creative Class: And How It’s Transforming Work, Leisure, Community And Everyday Life, almost reads like a textbook for mayors. All cities had to do was lure a few artists into live-work lofts in an old warehouse district, maybe convince a startup—they weren’t even called startups then, were they?—to set up shop in a post-industrial neighborhood. Voila! Florida’s prescription for city success.