 An example of a more explicit theoretical account of phenomenal character, phenomenal content and their relation can be found in Tye (1995). He proposes a representationalist account of phenomenal character. For a state to have phenomenal character is to represent internal or external physical items in an ‘abstract’ and nonconceptual way that is “appropriately poised for use by the cognitive system” (see Tye 1995, 137–144). According to Tye, there are two kinds of phenomenal concepts: indexical concepts (an example is the concept applied when thinking of a particular shade of red as “this particular hue” while having a red experience) and what he calls “predicative phenomenal concepts” that are based on the capacity to make certain discriminations. Tye wishes to accommodate the natural intuition that Mary before release cannot fully understand the nature of phenomenal blueness (she doesn’t really know what it is to have a blue experience). One might think that his view is incompatible with the intuition at issue. Phenomenal blueness, according to his view, has a physical nature and one might expect that physical natures are fully describable in physical terms and fully understandable under a physical conceptualization. But Tye has a surprising response: although phenomenal blueness has a physical nature, a person cannot fully understand its nature unless she thinks of phenomenal blueness under a phenomenal concept.