How are Stereotypes Addressed by Artists?

Subsequent to reading The Lone Ranger and Tonto Fistfight in Heaven, by Sherman Alexie, and "Black Men and Public Space", by Brent Staples, our primary focus in class was about stereotypes and how it can alter a person's perspective of a race.  Stereotypes affect all races, but it is more prevalent for African Americans because, for a large part of American history, African Americans have been negatively classified as second-class citizens, thus being treated inferior to whites.  This problem has been addressed by many artists, but I feel that the artist Charles White creates works of aesthetic value while addressing this issue.
Charles White is an African American artist that lived during the Civil Rights Movement, and whose artwork depicts the lives of African Americans in Black America.  While researching his work, I came across one of his lithographs that I found interesting, called Sounds of Silence 11.

Sounds of Silence 11 by Charles White 

Sounds of Silence 11 was White's way of expressively describing the distress of African Americans due to racism and stereotypes during the Civil Rights Movement.  The focal point of this lithograph is the conch shell.  In many cultures around the world, the conch shell, due to its loud vibrations and religious ennoblement, calls people to gather and support a cause.  Therefore, in White's lithograph, the conch shell symbolizes the awakening, or call, of African Americans to gather and take action in the Civil Rights Movement.  Stereotypes are the basis of prejudice and vice versa, and artists, such as Charles White, address this problem in hope that people realize the problems that stereotypes create.