OF THE DIFFERENT LIGHT AND SHADE IN VARIOUS ASPECTS AND OF OBJECTS
PLACED IN THEM.

If the sun is in the East and you look towards the West you will see
every thing in full light and totally without shadow because you see
them from the same side as the sun: and if you look towards the
South or North you will see all objects in light and shade, because
you see both the side towards the sun and the side away from it; and
if you look towards the coming of the sun all objects will show you
their shaded side, because on that side the sun cannot fall upon
them.

The law of the incidence of light.