These books focus with extreme detail on four paradigmatic gridded cities, Manhattan, Chicago, Barcelona, and Hangzhou by analyzing these cities and proposing their own interventions that implicate the grid in productive ways. They emphasize the value of open forms for city design, and specifically insist that the grid has the unique capacity to absorb and channel urban transformation flexibly and productively. In both historical and projective, this series of books explore the potential of the grid as a design tool to produce a multitude of urban processes and forms. AUTHOR: Joan Busquets, a world-renowned urban planner and architect, is the first Martin Bucksbaum Professor in Practice of Urban Planning and Design at the Harvard Graduate School of Design.