For 10 points, identify this banner, an anachronistic version of which is held aloft in Emanuel Leutze's Washington Crossing the Delaware.
A version of this object created by David Hammons is located outside of the Studio Museum of Harlem. A dream inspired another artist to create a version of this object which is completely white except for smudged charcoal lines. A mass of these objects makes up the upper right of the painting Avenue in the Rain. One artist used the phrase "things the mind already knows" to explain his depictions of this object, as well as of maps and (*) targets. That artist painted this object on three increasingly small canvases which he stacked on each other. Encaustic paint over newspapers was used to create several paintings of this object by Jasper Johns. For 10 points, identify this banner, an anachronistic version of which is held aloft in Emanuel Leutze's Washington Crossing the Delaware.
A version of this object created by David Hammons is located outside of the Studio Museum of Harlem.
American flags [or flags of the United States; prompt on flags or equivalents] (Avenue in the Rain is by Childe Hassam.)