1. Known knowns
2. Known unknowns
3. Unknown unknowns
4. Unknown knowns (the unconscious)
We are slaves to our unknown knowns.
the imagination of the good artist or thinker produces continuously good, mediocre, and bad things, but his judgment, trained and sharpened to a fine point, rejects, selects, connects... All great artists and thinkers (are) great workers, indefatigable not only in inventing, but also in rejecting, sifting, transforming, ordering.