"Philosophers can't explain what mental pictures are because we're not exterior objects - and our mental images have to be similar to those objects."
How come the fact the we're not exterior objects makes philosophers unable to tell what mental images are?
What does it mean we can't be an exterior object?
Does it means that we can't see our mind from outside - we're not exterior objects to ourselves (something that I can't imagine how could happen)?
In which case we could observe how the mental image in object A (our conscience) would be born: through the interaction of object A1 (our spiritual-soul-physical organism) with the other object (a red table).
Through the part of the world that I perceive as my own subject the current of the general processes of the world passes.
What I perceive as my own subject?
A bunch of sensations, feelings, warmth/coldness, thoughts, that-who-weaves-thoughts, a feeling that I am a permanent person.
What processes R.S had in mind?