Charles E. Burchfield (1893-1967), Opening of Valkyries, Colors seen on hearing Serenade, from “Book 9/Wagner’s Music: Abstract (Hieroglyphics) to represent music”, March 13, 1915; pencil on paper, 7 7/8 x 4 ½ inches; Burchfield Penney Art Center, Charles E. Burchfield Foundation Archives, Gift of the Charles E. Burchfield Foundation, 2006