 The third concern is that a disjunctive account cannot accommodate all the prima facie motivations for determinables. Again, our perceptions of and thoughts about determinables do not appear to be perceptions of or thoughts about disjunctions of maximal determinates. Rosen (2010) presses this point, noting that a “suggestive line of thought weighs against” disjunctivism, as per a case in which someone familiar with many shades of blue has no conception of cerulean (indeed, is perhaps even incapable of thinking of this shade), but where this deficit “would not prevent him from being competent with the word ‘blue’, or from knowing a great deal about the color blue” (2010: 128).