Michael Marder's patient and lucid work reminds us how categories and concepts are different, and that a phenomenological approach, allied with Kantian reflection, can help us think about political matters through an expanded and refined understanding of political categories. In a political world where simplistic reductions tend to reign, Marder offers a thoughtful reconsideration of categories as offering greater descriptive power and critical complexity than concepts that suppress the specificity of political phenomena. This is an important book that gives us both the example and the ideal of a political philosophy tasked with understanding the field of conflict in the service of an expansive pluralism.