 Papineau (1996) distinguishes third person and first person thoughts about experiences. First person thoughts involve the imagination of an experience of the relevant kind. The basic idea may be put like this: When Mary is finally released and after some time sufficiently acquainted with color experiences she can ‘reproduce’ blue experiences in her imagination. These imaginations of experiences of a particular kind can be used to refer to experiences of the kind at issue and to think about them. Obviously, Mary could not have first person thoughts about color experiences (she could not use imagined blue experiences in order to refer and to think about blue experiences) before she ever had blue experiences. After release, Mary can acquire new beliefs: first person beliefs about blue experiences. But for every such new first person belief about a given kind of experience, there will be one of her old third person beliefs which refers to the same kind of experience and has the same factual content.