Exciting cities stay exciting, and boring cities stay boring.

Cities are the crucible of civilization.

Cities tolerate crazy people. Companies don't.

Cities are obvious metaphors for life. We call roads 'arteries' and so forth.

Cities are just a physical manifestation of your interactions, our interactions, and the clustering and grouping of individuals.

We form cities in order to enhance interaction, to facilitate growth, wealth creation, ideas, innovation, but in so doing, we create, from a physicist's viewpoint, entropy.