" The world is full of mostly invisible things,
And there is no way but putting the mind's eye
Or its nose, in a book, to find them out...
... such things are said to be good for you,
And you will have to learn them
In order to become one of the grown-ups
Who sees invisible things neither steadily nor whole,
But keeps gravely the grand confusion of the world
Under his hat, which is where it belongs."

From To David, About His Education
a poem by Howard Nemerov