The Republic by Plato Part 10 Page 26

True.

And the same object appears straight when looked at out of the water, and crooked when in the water; and the concave becomes convex, owing to the illusion about colours to which the sight is liable. Thus every sort of confusion is revealed within us; and this is that weakness of the human mind on which the art of conjuring and of deceiving by light and shadow and other ingenious devices imposes, having an effect upon us like magic.

True.

And the arts of measuring and numbering and weighing come to the rescue of the human understanding — there is the beauty of them — and the apparent greater or less, or more or heavier, no longer have the mastery over us, but give way before calculation and measure and weight?