Now, as art completes itself, each of these schools retain their separate characters, but they cease to depend on lines, and learn to represent masses instead, becoming more refined at the same time in all modes of perception and execution.
 . . . A line of absolute correctness, observe. I do not care how slowly you do it, or with how many alterations, junctions, or retouching; the one thing I ask of you is, that the line shall be right, and right by measurement, to the same minuteness which you would have to give in a Government chart to the map of a dangerous shoal.
