First, about your _one-eyed_ and _two-eyed_ theory of
art, etc. etc. I do not altogether agree with you. We do not see _all
objects_ wider with two eyes than with one. A spherical or curved object
we do see so, because our right and left eye each see a portion of the
surface not seen by the other, but for that very reason the portion seen
perfectly with both eyes is _less_ than with one. Thus [_see_ diagram on
next page] we only see from A to A with both our eyes, the two side
portions Ab Ab being seen with but one eye, and therefore (when we are
using both eyes) being seen obscurely. But if we look at a flat object,
whether square or oblique to the line of vision, we see it of exactly
the same size with two eyes as with one because the one eye can see no
part of it that the other does not see also. But in painting I believe
that this difference of proportion, where it does exist, is far too
small to be _given_ by any artist and also too small to affect the
picture if given.
[Illustration]
Again, I entirely deny that by _any means_ the exact effect of a
landscape with objects at various distances from the eye can be given on
a fiat surface; and moreover that the monocular clear outlined view is
quite as true and good on the whole as the binocular hazy outlined view,
and for this reason: we cannot and do not see clearly or look at two
objects at once, if at different distances from us.
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