But though the tangible and visible
magnitude in truth belong to two distinct objects: I shall nevertheless
(especially since those objects are called by the same name, and are
observed to coexist), to avoid tediousness and singularity of speech,
sometimes speak of them as belonging to one and the same thing.
56. Now in order to discover by what means the magnitude of tangible
objects is perceived by sight. I need only reflect on what passes in my
own mind, and observe what those things be which introduce the ideas of
greater or lesser into my thoughts, when I look on any object. And these
I find to be, FIRST, the magnitude or extension of the visible object,
which being immediately perceived by sight, is connected with that other
which is tangible and placed at a distance. SECONDLY, the confusion or
distinctness. And thirdly, the vigorousness or faintness of the aforesaid
visible appearance. CETERIS PARIBUS, by how much the greater or lesser
the visible object is, by so much the greater or lesser do I conclude the
tangible object to be. But, be the idea immediately perceived by sight
never so large, yet if it be withal confused, I judge the magnitude of
the thing to be but small. If it be distinct and clear, I judge it
greater. And if it be faint, I apprehend it to be yet greater.
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