The Challenge of Originalism does many things well: it showcases the sophistication of current originalist scholarship; it displays the resonance that originalist arguments have with diverse and international audiences; and it reminds us that originalists are far from having won the debate. The Challenge of Originalism brings together some of the leading lights of originalist scholarship, and puts them in conversation with each other and with prominent critics. The Challenge of Originalism also, as all collections must, leaves out some important topics. Most prominent is originalism’s relationship to nonoriginalist precedent, a subject of significant scholarly interest over the past ten years. Also, The Challenge of Originalism introduces some of the key recent originalist moves, such as incorporating the concept of constitutional construction, without fully elucidating them. The essays in The Challenge of Originalism are consistently nuanced and thought-provoking. The Challenge of Originalism includes introductory material to originalism and the debates surrounding it, and its consistently high level of sophistication also makes it valuable to scholars already engaged in these debates. In Part II, I first describe the important contributions made by and in The Challenge of Originalism. In particular, The Challenge of Originalism showcases originalism’s sophistication and broad appeal. Then, in Part III, I suggest two important and unresolved challenges to originalism: (1) fully explaining the nature and scope of constitutional construction; and (2) describing what role, if any, nonoriginalist precedent retains in originalism. I end, in Part IV, by suggesting that the essays exemplify the chief reason for originalism’s continuing and broad-based allure — the reason it presents a challenge — the Constitution’s writtenness.