  Wolterstorff accepts the thesis that works of art neither come into nor go out of existence (1980, 88–89). A kind, K, exists if and only if the correlated property, k, exists. With regard to the existence of properties, Wolterstorff’s initial view (1970) was that for any property, being-f, this property exists just in case either something is-f or something is not-f. Criticisms (John Perry 1974) involving Russell’s paradox of unexemplified properties led him to qualify this “general predicate entailment principle.”