Very many of the side issues dealt with in A Study of Qualities and The Structure of Appearance reappear in Goodman’s later philosophy. The “grue”-problem (to be explained in the next section) as a problem of what predicates to use for projection and the related problem of how to analyze disposition predicates, as well as the question of how to explicate simplicity, tense, aboutness, and so on, all have their roots in Goodman’s dissertation. Alas, his most important work is also his most complicated, which is perhaps the reason why it is so often ignored. Other writings by Goodman are seemingly more accessible and have thus attracted a wider readership. However, it is arguable that the significance of Goodman’s “easier” pieces cannot be assessed adequately without relating them to the problems and projects of A Study of Qualities and The Structure of Appearance.