@Owen phil,
Wittgenstein:
5.631 There is no such thing as the subject that thinks or entertains
ideas. If I wrote a book called The World as l found it, I should have
to include a report on my body, and should have to say which parts were
subordinate to my will, and which were not, etc., this being a method of
isolating the subject, or rather of showing that in an important sense
there is no subject; for it alone could not be mentioned in that book.--
5.632 The subject does not belong to the world: rather, it is a limit of
the world.
5.633 Where in the world is a metaphysical subject to be found? You will
say that this is exactly like the case of the eye and the visual field.
But really you do not see the eye. And nothing in the visual field
allows you to infer that it is seen by an eye.