As usual, there were a ton of artists and musicians at the political conventions this year. And that raises some questions. How much should artists get involved in politics? How can artists best promote social change?

One person who serves as a model here was not an artist but understood how to use a new art form. Frederick Douglass made himself the most photographed American of the 19th century, which is kind of amazing. He sat for 160 separate photographs (George Custer sat for 155 and Abraham Lincoln for 126). He also wrote four lectures on photography.

Douglass used his portraits to change the way viewers saw black people. Henry Louis Gates Jr. of Harvard points out that one of Douglass’s favorite rhetorical tropes was the chiasmus: the use of two clauses in a sentence in reversed order to create an inverse parallel.

For example, Douglass wrote, “You have seen how a man was made a slave; you shall see how a slave was made a man.”