PERSPECTIVE--PROPOSITION.
Objects that are farther off can never be so large but that those in
front, though smaller, will conceal or surround them.
DEFINITION.
This proposition can be proved by experiment. For if you look
through a small hole there is nothing so large that it cannot be
seen through it and the object so seen appears surrounded and
enclosed by the outline of the sides of the hole. And if you stop it
up, this small stopping will conceal the view of the largest object.
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