The built environment around us seems almost natural, as in beyond our control to alter or shape. Indeed, we have reached a point in history when cities—the largest and most complex of our settlements—are more scientifically planned, managed, and controlled than ever, leaving relatively little room for citizen input in their design or look, or in the activities allowed in them. But when we look closely we see many examples of interventions that everyday citizens make to their surroundings, ranging from graffiti and skateboarding to musical and theatrical performances and protests in public space. But a recent set of these endeavors found in today’s built environment strives for something besides artistic or political expression. In his well-researched, eye-opening new book, The Help-Yourself City: Legitimacy and Inequality in DIY Urbanism (Oxford University Press, 2018), sociologist Gordon Douglas takes readers onto the streets and public spaces of cities around the world to reveal the projects and practitioners of “DIY urban design,” a specific type of informal interventions in urban public space that emphasizes functionality and civic-mindedness in physical alternations and additions. Through such projects as building and installing benches in places lacking seating and posting signage to both encourage and guide walking in neighborhoods, Douglas’s DIY urban designers, who are relatively privileged socially, aim to improve their cities in ways they feel local governments should but don’t or can’t, and in ways that are beneficial and helpful for everyone. The book shines when he explores the implications for such practices for revealing and exacerbating inequality in today’s segregated city. Ultimately, as these practices continue, and as city governments and planning agencies borrow and implement many of the ideas and projects of DIY urban design, the book encourages a consideration of the real issues of inclusion and exclusion that they signify for the sake of achieving greater levels of equality in public space.