Seeing is a function of the eyes; yet we also use this word for the other senses as well, when we exercise them in the search for knowledge. We do not say, "Listen how it glows," "Smell how it glistens," "Taste how it shines," or "Feel how it flashes," since all of these are said to be seen. And we do not simply say "See how it shines," which only the eyes can perceive; but we also say, "See how it sounds, see how it smells, see how it tastes, see how hard it is."

—Augustine, Confessions