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A dark object will appear bluest in proportion as it has a greater
mass of luminous atmosphere between it and the eye. As may be seen
in the colour of the sky.
3
04.
The atmosphere is blue by reason of the darkness above it because
black and white make blue.
3
05.
In the morning the mist is denser above than below, because the sun
draws it upwards; hence tall buildings, even if the summit is at the
same distance as the base have the summit invisible. Therefore,
also, the sky looks darkest [in colour] overhead, and towards the
horizon it is not blue but rather between smoke and dust colour.
The atmosphere, when full of mist, is quite devoid of blueness, and
only appears of the colour of clouds, which shine white when the
weather is fine. And the more you turn to the west the darker it
will be, and the brighter as you look to the east. And the verdure
of the fields is bluish in a thin mist, but grows grey in a dense
one.
The buildings in the west will only show their illuminated side,
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