 The various accounts of fiction discussed so far in this section disagree on numerous points, and, although pretense or imagination-based accounts are probably the most widely supported, each one faces challenges and there is no consensus as to which version is correct. But perhaps the most radical challenge to all of these attempts to specify the nature of fiction has come from theorists who think that the enterprise of finding necessary and sufficient conditions for what it takes to be a work of fiction should be abandoned. Such theorists think that there are genuine borderline cases and cases that are, in some sense, admixtures of fiction and non-fiction, and that such cases show that it is wrong to try to capture the notion of fiction in terms of necessary and sufficient conditions. (Note that the main target for this challenge are theorists who think that there are intuitive concepts of fiction and non-fiction that are worth articulating in the first place. As we saw earlier, Walton’s approach is different: he urges replacement of the traditional distinction.)