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Excerpt from A Practical Treatise on Perspective, Adapted for the Study of Those Who Draw From Nature, by Which the Usual Errours May Be Corrected
Gasper Poussin frequently placed his horizon about one-third from the top of the picture, which inclined it to a bii'd'sjeye View, yvhene the land appears much larger in space than the sky. On the centretof this line, all thelines 'of objects Which go direct from the spec tator, vanish Which place is called the pomt of sight, and those lines Which go obliquely from him, vanish on other points of the same line. This line is the height of the spectator' 5 eye; therefore, above it, no pool of water, nor any surface Which is level, can be seen and, on it, all obj ects, howev er laro' ge, vanish 111 a point.
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