I critically evaluate the notion of structure Ted Sider presents in Writing the Book of the World. A prerequisite to understanding Sider’s notion of structure is understanding Sider’s take on ideology and ontology. In Section II, I discuss this. In Section III, I consider arguments in favor of structure. In Section IV, I examine one debate that is considered by Sider to be nonsubstantive: the debate over modality. I conclude, in Section V, by examining the reception Writing the Book of the World has received in the philosophical community.