Each of these drawings was generated during the playback of a symphony by Ludwig van Beethoven. If you are familiar with the music, you should be able to sense the differences between them. Beethoven’s Ninth Symphony is over twice as long as many of the others and as a result, its drawing is more dense. Its chorale gives Ninth its vibrant yellows. In Beethoven’s Fifth Symphony, the deeper tones of its distinctive four-note motif give Fifth its deeper, red tone.