A Treatise on Painting/Chapter 317
Appearance
Chap. CCCXVII.—Of Towns and other Buildings seen through a Fog in the Morning or Evening.
Buildings seen afar off in the morning or in the evening, when there is a fog, or thick air, shew only those parts distinctly which are enlightened by the sun towards the horizon; and the parts of those buildings which are not turned towards the sun remain confused and almost of the colour of the fog.