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E.g. Swapped spectra: in this matter, there is no final fact. No convincing solution (majority/minority).
Lewis : There is a good sense in which the alleged victim of the mix-up sees red when it looks at grass; it is in a state that holds the role of seeing red in humanity as a whole.
And there is an equally good sense in which it then sees green: it is in a state that holds the role of seeing green for itself and a small sub-group to which it belongs as an ordinary member, and which has a certain right to be seen as a natural kind. You can say both, albeit not at the same time.
Die Identität von Körper und Geist Frankfurt 1989
Konventionen Berlin 1975
Philosophical Papers Bd I New York Oxford 1983
Philosophical Papers Bd II New York Oxford 1986
Cl. I. Lewis
Mind and the World Order: Outline of a Theory of Knowledge (Dover Books on Western Philosophy) 1991