Too often debates are sterile. Each participant lines up behind the other, each with their own point of view. All is on show but nothing much happens. This debate is different. Something happened. (Nigel Thrift, University of Warwick) This is an especially welcome book. It is rare that one has the opportunity to be a near eye witness to a constructive and intellectually generous exchange of provocative ideas-in-the-making. Graham Harman, Bruno Latour and the assembled audience put on a great show. The exchange is fresh, laced with good humor, and informative. There is much to be learned here about empirical metaphysics-and collegiality. (Michael Flower, Portland State University)