Joe Diggs is rooted in the African-American heritage not only of Cape Cod but of United States history. His subjects range from memories of his family's local bar (Twin Villas) to the community that was lost by the absorption of the Negro League by Major League Baseball (the Baller Series). Other artworks commemorate Black cultural figures such as James Baldwin as well as war veterans from his family. It is through this visual story-telling that Diggs presents a history that is too often marginalized by white-washed American culture.