These books focus with extreme detail on four paradigmatic gridded cities, Manhattan, Chicago, Barcelona, and Hangzhou by analysing these cities and proposing their own interventions that implicate the grid in productive ways. They emphasise 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.