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Volume  Volume1\Linear Perspective

Entry#  107. On natural perspective (107--109).

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OF EQUAL OBJECTS THE MOST REMOTE LOOK THE SMALLEST.

The practice of perspective may be divided into ... parts Footnote

4: _in_ ... _parte_. The space for the number is left blank in the

original. , of which the first treats of objects seen by the eye at

any distance; and it shows all these objects just as the eye sees

them diminished, without obliging a man to stand in one place rather

than another so long as the plane does not produce a second

foreshortening.

But the second practice is a combination of perspective derived

partly from art and partly from nature and the work done by its

rules is in every portion of it, influenced by natural perspective

and artificial perspective. By natural perspective I mean that the

plane on which this perspective is represented is a flat surface,

and this plane, although it is parallel both in length and height,

is forced to diminish in its remoter parts more than in its nearer

ones. And this is proved by the first of what has been said above,

and its diminution is natural. But artificial perspective, that is

that which is devised by art, does the contrary; for objects equal

in size increase on the plane where it is foreshortened in

proportion as the eye is more natural and nearer to the plane, and

as the part of the plane on which it is figured is farther from the

eye.

And let this plane be _d e_ on which are seen 3 equal circles which

are beyond this plane _d e_, that is the circles _a b c_. Now you

see that the eye _h_ sees on the vertical plane the sections of the

images, largest of those that are farthest and smallest of the

nearest.

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