In 1970, Richard Sennett published his groundbreaking book, The Uses of Disorder, which argued that the ideal of the well-planned, orderly city had its flaws. Fifty years later, Sennett returns to these still-fertile ideas and, together with activist and architect Pablo Sendra, develops an agenda for the design and ethics of the “Open City.” In this bold book, Sendra and Sennett propose to rethink how we think about our cities and plan public life within them. They combine architecture, politics, urban planning, and activism to develop places that nourish rather than suppress, unite rather than divide, remain open to change rather than close themselves off from it.