Richard Florida interviews the author of a new book on cities and complexity. Here is one of the more interesting questions:

What do you think is the best way to think about cities: as machines, ecosystems, living organisms, or something else?

The fascinating thing about cities is that different aspects of them allow us to think about them in many different ways. At the level of urban infrastructure, cities certainly have features of machines, with vast constructed networks involved in transporting people, water, electricity, and waste.

At the level of the economy, cities resemble complex ecosystems, with companies and individuals filling specific niches and all living and working in a symbiotic dance. And at the level of growth and change, cities also feel like living, breathing, constantly growing and changing organisms.

But ultimately, the fact that a city has features of both a machine, a societal ecosystem, as well as a living thing means that a city is truly its own category: a novel type of socio-technological system that humans have made, and is perhaps one of our more incredible inventions.

I like this response: we have a tendency to reduce complex social phenomena to understandable objects (like machines – think of how often the brain is compared to a computer) but this often isn’t possible. Understanding all of the social relationships involved – and this could include relationships between people as well as between people and objects or nature – should lead us to some humility of how much we can know and predict as well as a fascination regarding how it all works. (Or, perhaps this fascination just applies to people like sociologists)

If indeed cities are complex systems, this could lead to questions of whether that complexity has drawbacks in the long run that cannot be overcome. (Parenthetically, such questions could also apply to nation states.) At some point, complexity may produce diminishing returns as argued by anthropologist Joseph Tainter. This reminds me that Jane Jacobs suggested organizing cities in districts that weren’t too big or small so that they could attend to smaller matters while also allowing community involvement. Americans tend to like smaller local government but the combined resources and interactions between larger groups of people can lead to more unusual benefits.