On Painting by Leon Alberti

Author:Leon Alberti
Language: eng
Format: epub
Tags: Art, History, Renaissance, Techniques, Painting, Medieval
Publisher: Penguin UK
Published: 2005-03-31T05:13:24+00:00

Figure 6 Proportional intervals produced by parallel intersections of visual pyramid

AB : BC : CD : DE = FG : GH : HI : IJ = KL : LM : MN : NO

quantities seen will occupy either more or less rays. You have seen how any lesser triangle may be proportional to a greater, and remember that the visual pyramid is made up of triangles. So all we have said about triangles may be transferred to the pyramid, and we may be sure that no quantities of the surface that are equidistant from the intersection of the pyramid, undergo any change in the painting; for those equidistant quantities are equal, at any equidistant intersection, to those proportional to them. From this it follows that if the quantities that make up the outline of a surface are not changed, there occurs no change in that outline in the painting. And so it is clear that any intersection of the visual pyramid equidistant from the surface seen is proportional to that surface (Fig. 6).

16. We have spoken of the surfaces proportional to the intersection, that is, equidistant from the painting surface. But as many surfaces are not equidistant from the painting surface, we must inquire carefully into these, so that the entire system of the intersection may be made clear. Yet it would be a long, difficult, and extremely

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