The first thing in painting is that the objects it represents should appear in relief, and that the grounds surrounding them at different distances shall appear within the vertical plane of the foreground of the picture by means of the three branches of Perspectives, which are: the diminution in the distinctness of the forms of the objects; the diminution in their magnitude; and the diminution in their color. And of these three classes of Perspective the first results from [the structure of] the eye, while the other two are caused by the atmosphere that intervenes between the eye and the
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