 Locke contends that his position has certain advantages over more logical theories of value. In particular, it is better able to explain certain value phenomena that are troubling for the latter type of theories. Phenomena such as transvaluation, value merging, and value conflict are able to be explained in terms of the basic doctrine that the mode of valuation is determined by the character of a subject's affective response in a value context. Locke claims that logical theories of value have historically had difficulty accounting for phenomena such as the aesthetic appraisal of a logical or mathematical proof; moral commitment to aesthetic production; or aesthetic appreciation of religious practice. In particular, logical theories have struggled to make sense of assigning predicates from one value-type to objects that are traditionally the content of a different value-type as when a proof in logic is deemed beautiful or ugly. Traditional theories treat such value predication as merely metaphorical or analogical. 