Parade—Hoboken, New Jersey, 1955 – Robert Frank
Photograph © Robert Frank, from The Americans

(Robert Frank, American, b. 1924 in Switzerland)

Flag. 1954–55  – Jasper Johns (b. 1930)
Encaustic, oil, and collage on fabric mounted on plywood (three panels)
42 1/4 x 60 5/8″ (107.3 x 154 cm)

As I notice the appearance of the United States flag on Memorial Day these two works always come to mind.