The National Portrait Gallery in Washington has launched an exhibition called American Cool, which features 100 Americans who fit the criteria. The curators took five years to pull the exhibition together and defined cool by four chief characteristics--originality of artistic vision, and especially of a signature style; cultural rebellion, or transgression in given historical moment; iconicity, or a certain level of high-profile recognition; recognized cultural legacy (lasting more than a decade). each of those included had to fit at least three of those categorizations. Walt Whitman, described as a guiding light of American Bohemia, kicks it off. Australian Kim Sajet, who is the Director of the Gallery said that "Cool is America's greatest cultural export," a bold statement. Like many of America's cultural exports, cool, as we understand it today, was born in African-American culture specifically jazz culture in the early 1940s. As usual, a debt is owed to an often marginalized community whose contribution to American cultural life cannot be over-estimated.