If the relevant features of color similarity and difference are features presented in or represented in experience, those features stand in relations of similarity and difference.

The claim, here, is that what it is like to for something to look red is more similar to what it is like for something to look orange than it is to what it is like for something to look blue. This solution, however, raises the question of what features of the experience are relevant ones, i.e., are the features which stand in the relations of similarity and difference. There seem to be two possibilities: (i) they are features of the experiences themselves; (ii) they are features presented in exp