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Phenomenalism/Brandom: Slogan: "Being means to be perceived" - The represented is explained in concepts of the representing and not vice versa - Object and proposition are structures or constructions of perceptions - existence, independence and propositions are characteristics of assignment.
Facts about having propositional supervene facts about the appearance - i.e. first the observation must be explained. Without reference on what it means to be a thing, it needs to be explained what it means to be regarded as a thing - then you can say that there is no fact about which things are red - VsPhenomenalism: has notoriously failed - Cartesian dualism appearance as a basis certainty "that it seems to me".
Expressive Vernunft Frankfurt 2000
Begründen und Begreifen Frankfurt 2001