Quotation from: The Notebooks of Leonardo Da Vinci
Written by: Leonardo da Vinci
234.
PERSPECTIVE.
Why objects seen at a distance appear large to the eye and in the
image on the vertical plane they appear small.
PERSPECTIVE.
I ask how far away the eye can discern a non-luminous body, as, for
instance, a mountain. It will be very plainly visible if the sun is
behind it; and could be seen at a greater or less distance according
to the sun's place in the sky.