To my way of thinking, the concept drawings that Rembrandt...

To my way of thinking, the concept drawings that Rembrandt did, the drawings he made that he used to model his artists, to work out the compositions of his paintings: those are cartoons. Look at his sketch for the return of the prodigal son. The expression on the angry younger brother's face. The head is down; the eyebrow is just one curved line over the eyes. It communicates in a very shorthand way. It's beautiful, expressive, and, in a peculiar way, it's more powerful than the kind of stilted, formalized expression in the final painting.