What is the theme in Beyond the Horizon by Eugene O'Neill?

Dreams provide the main theme of the play. Every one of the characters has dreams. Ruth dreams of having a husband. James dreams of having a bigger farm and hopes that his son, Andy, will marry Ruth Atkins so that they can take over the adjoining Atkins farm. Says James, "Joined together they'd make a jim-dandy of a place, with plenty o' room to work in." However, the biggest dreamers in the story are Robert and Andy, who have opposite dreams. Robert is a poet and has the romantic dream of going "beyond the horizon" to experience the world.