Book excerpt: What if divided neighborhoods were causing public health problems? What if a new approach to planning and design could tackle both the built environment and collective well-being at the same time? What if cities could help each other? Dr. Mindy Fullilove, the acclaimed author of Root Shock, uses her unique perspective as a public health psychiatrist to explore ways of healing social and spatial fractures simultaneously. Using the work of French urbanist Michel Cantal-Dupart as a guide, Fullilove takes readers on a tour of successful collaborative interventions that repair cities and make communities whole.