 The idea that naturalness matters to epistemic value strikes some as mysterious. Dasgupta  (2018)  doubts that there is any more non-instrumental value in learning about the distribution of natural properties than in learning about the distribution of  unnatural ones, on the grounds that there would need to be some deeper explanation for such value-theoretic facts, and no adequate explanation is available. His strategy is to consider some other feature of properties he calls “graturalness”, which grueness is stipulated to have to a higher degree than greenness. When the opponent attempts to explain the evaluative importance of naturalness by appealing to some feature which naturalness necessarily has and graturalness necessarily lacks (e.g. making for similarity), Dasgupta will respond by introducing a corresponding “grueified” feature which graturalness necessarily has and naturalness necessarily lacks (e.g. making for “grimilarity”), and complain that the explanatory challenge has merely been pushed back rather than met, since we now need an explanation for the claim that the feature the opponent pointed to has an evaluative significance that its grueified counterpart lacks. This strategy is extremely general: indeed, it is unclear whether any claim of non-instrumental value could be explained in a way that would satisfy Dasgupta’s criteria for adequate explanation.