Gustave Flaubert said that despite our best attempts to express ourselves artistically, human effort is all too often "like a cracked kettle on which we can tap crude rhythms for bears to dance to, while we long to make music that will melt the stars." Picasso once addressed the comment that his work was difficult to understand with this reply: "Why does art need to be understood to be enjoyed? When you hear a bird sing, do you need to know the words in order to appreciate the music?"