What is the fine-grained topic of the following text: In her column for the Reporter-Telegram, Museum of the Southwest curator Wendy Earle discussed how Warhol explored race relations in his 1964 piece “Birmingham Race Riot” where he refurbished a photograph by Charles Moore into a photo screenprint on woven paper. Only return the topic.
Wendy Earle's discussion on Warhol's exploration of race relations in his artwork "Birmingham Race Riot"