 Reality as maximally determinate. One objection to irreducible determinables appeals to the supposition that reality itself is maximally determinate, such that there are no irreducible determinable properties; as Armstrong maintains, “[a]ll universals must be determinate” (1978b: 117). Relatedly, many suppose that there is no “vagueness” in the world; as Lewis maintains, “[t]he only intelligible account of vagueness locates it in our thought and language” (1986: 212).[16] 