The divisions of Perspective are 3, as used in drawing; of these, the first includes the diminution in size of opaque objects; the second treats of the diminution and loss of outline in such opaque objects; the third, of the diminution and loss of colour at long distances.
Leonardo da Vinci (2014). “Delphi Complete Works of Leonardo da Vinci (Illustrated)”, p.343, Delphi Classics
