The colours of the shadows in mountains at a great distance take a
most lovely blue, much purer than their illuminated portions. And
from this it follows that when the rock of a mountain is reddish the
illuminated portions are violet (?) and the more they are lighted
the more they display their proper colour.
464.
A place is most luminous when it is most remote from mountains.
On the treatment of light for views of towns (465-469).
465.