In the twenty-first century, cities worldwide must respond to a growing and diverse population, ever-shifting economic conditions, new technologies, and a changing climate. Short-term, community-based projects--from pop-up parks to open streets initiatives--have become a powerful and adaptable new tool of urban activists, planners, and policy-makers seeking to drive lasting improvements in their cities and beyond. These quick, often low-cost, and creative projects are the essence of the Tactical Urbanism movement. Whether creating vibrant plazas seemingly overnight or re-imagining parking...