Cities are complex systems where planners have often misidentified the elements required to create enough density to produce self-sustaining interactions.14 In cities, it’s not the amount of infrastructure that produces interactions, it’s how that infrastructure is laid out. A certain number of interactions are required for a city to function well and adapt to meet the needs of those living in it. What makes a city safe, interesting, prosperous, and creative isn’t the buildings or streets. It’s how the infrastructure fosters interactions and relationships between people.
