eye and to the camera obscura he deduces the means of producing an artificial construction of the pyramid of rays or—which is the same thing—of the image. The fundamental axioms as to the angle of sight and the vanishing point are thus presented in a manner which is as complete as it is simple and intelligible* (86—89).
Leonardo distinguishes between simple and complex perspective (90, 91). The last sections treat of the apparent size of objects at various distances and of the way to estimate it (92—109).
General remarks on perspective (40-41).
40.
ON PAINTING.
Perspective is the best guide to the art of Painting.
[Footnote: 40. Compare 53, 2.]
41.
The art of perspective is of such a nature as to make what is flat appear in relief and what is in relief flat.
The elements of perspective—Of the Point (42-46).
42.
All