 The differences between variants of the New Knowledge/Old Fact View concern the theoretical (physicalist) account of (a) phenomenal character, (b) phenomenal concepts of phenomenal characters and (c) the relation between phenomenal characters and the corresponding phenomenal concepts. All proponents of the view point out that, according to their proposal, physical concepts and phenomenal concepts are cognitively independent: it is impossible to see a priori that something that falls under a physical concept of a particular phenomenal character also falls under the corresponding phenomenal concept of that phenomenal character. This is why it is possible to have (like Mary) complete physical knowledge about e.g. phenomenal blueness (you know everything there is to know about phenomenal blueness under its physical conceptualization) without having a phenomenal concept of blueness and without knowing any of these facts under a phenomenal concept of blueness. Some have argued that the phenomenal conceptualization is not expressible in language (see Byrne 2002 and Hellie 2004).