 Second, the realist might seek to explain the pattern of individual conceptual possibility without conceptual co-possibility. For example, if it were a conceptual truth that ethical properties were natural properties, then this would explain the pattern of knowledge suggested here (Dreier 1992, 20). An analogy may help to make this vivid: it might be a conceptual truth that physical properties are natural properties (compare Kim 2011). But which total naturalistic patterns in the world the physical properties covary with is arguably an empirical question. One might take these examples to illustrate a general reply: the pattern is not puzzling, because it simply reflects the limitation of our conceptually-based insight into reality (Shafer-Landau 2003, 86).