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be perfect and will deceive the beholder, who will see the columns
as they are here figured.
Here the eye is in the middle, at the point a and near to the
columns.
[Footnote: The diagram which stands above this chapter in the
original with the note belonging to it: "a b e la ripruova" (a b
is the proof) has obviously no connection with the text. The second
sketch alone is reproduced and stands in the original between lines
2
2 and 23.]
5
45.
If you cannot arrange that those who look at your work should stand
at one particular point, when constructing your work, stand back
until your eye is at least 20 times as far off as the greatest
height and width of your work. This will make so little difference
when the eye of the spectator moves, that it will be hardly
appreciable, and it will look very good.
If the point of sight is at t you would make the figures on the
circle d b e all of one size, as each of them bears the same
relation to the point t. But consider the diagram given below and
you will see that this is wrong, and why I shall make b smaller
than d e [Footnote 8: The second diagram of this chapter stands in
388
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