This is a watercolor of a Wakinyan, which is a Thunder Spirit to the Lakota people. My model was a drawing called "Dream of a Wakinyan" by Black Hawk. He describes the picture as the Thunder Spirit riding a buffalo. The buffalo's tail forms a rainbow. The white spots represent hail. If a Wakinyan visits a person in a dream, they might become a Heyoka, which is a kind of sacred clown to the Lakota.