  The majority of contemporary discussions of the topic are devoted to explaining what makes category mistakes infelicitous, and a wide variety of accounts have been proposed including syntactic, semantic, and pragmatic explanations. Indeed, this is part of what makes category mistakes a particularly important topic: a theory of what makes category mistakes unacceptable can potentially shape our theories of syntax, semantics, or pragmatics and the boundaries between them. As Camp (2016, 611–612) explains: “Category mistakes … are theoretically interesting precisely because they are marginal: as by-products of our linguistic and conceptual systems lacking any obvious function, they reveal the limits of, and interactions among, those systems. Do syntactic or semantic restrictions block ‘is green’ from taking ‘Two’ as a subject? Does the compositional machinery proceed smoothly, but fail to generate a coherent proposition or delimit a coherent possibility? Or is the proposition it produces simply one that our paltry minds cannot grasp, or that fails to arouse our interest? One’s answers to these questions depend on, and constrain, one’s conceptions of syntax, semantics, and pragmatics, of language and thought, and of the relations among them and between them and the world.”