On April 27, 2007, the first Speculative Realism (SR) workshop was held at Goldsmiths, University of London, featuring four young philosophers whose ideas were loosely allied. Over the ensuing decade, the ideas of SR spread from philosophy to the arts, architecture, and numerous disciplines in the humanities and social sciences. SR has been arguably the most influential new current in continental philosophy since the works of Gilles Deleuze and Félix Guattari found their second wind in the 1990s. But what is SR? This book is the first general overview by one of its original members, focusing on the aesthetic, ethical, ontological, and political themes of greatest importance to the movement. Graham Harman provides a balanced but critical assessment of his original SR colleagues, Ray Brassier, Iain Hamilton Grant, and Quentin Meillassoux, along with a clear summary of his own Object-Oriented Ontology (OOO).