13) ˇWe imagine that The expression “I can't see what you see” has been given sense by explaining it to mean: “I can't see what you see being in a different position relative to the object we are looking at”, or “ … having not as good eyes as you”, or “ … having found as in … that B sees something which we don't though we look at the same Object. etc. I can't see your afterimage might be explained to mean I can't see what you see if I close my eyes meaning when you say you see a red circle I see a yellow one.
  14) Identity of physical objects, of shapes, colours, dreams, toothache.
  15) (The
object
thing
we see) The physical Object & its appearance. Form of expression: different views of the same phys. object are different objects seen. We ask “What do you see” & he can either answer “a chair”, or „this” (& draw the particular view of the chair). So we are now inclined to say that each man sees a different object & one which no other person sees, for even if they look at the same chair from the same spot it may appear different to them & the objects before the other minds eye I can't look at.

  16) (I can't know whether he sees anything
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at all or only behaves as I do when I see something.) There seems to be an undoubted asymetry in the use of the word “
to
I
see” (& all words relating to personal experience). One
is inclined to
can
state this in the way that “I know when I see something by just seeing it, without hearing what I say or observing the rest of my behaviour whereas I know that he sees & what he sees only by observing his behaviour, i.e. indirectly”.
  a) There is a mistake in this ◇◇◇: I know what I see because I see it”. What does it mean to know that.
  b) It is truet to say that my reason for saying that I see is not the observation of my behaviour. But this is a gramm.prop.
  c) It seems to be an imperfection that I can only know ‒ ‒ ‒. But this is just the way we use the word ‒ ‒ ‒. – Could we then … if we could? Certainly.