. . . . . "Such artists as Arshile Gorky, Mark Rothko, Morris Graves, Mark Tobey, and Helen Frankenthaler developed and employed abstraction in works of highly personal symbolic content, while painters such as Jackson Pollock, Willem de Kooning, Adolph Gottlieb, and Franz Kline created a bold and unique imagery that made American painting a dominant influence in world art (see abstract expressionism)." . . .