How does Eugene O'Neill use imagery in Beyond the Horizon?

Imagery:

You mustn't feel sorry for me. Don't you see I'm happy at last — free — free! — freed from the farm — free to wander on and on — eternally! Look! Isn't it beautiful beyond the hills? I can hear the old voices calling me to come — And this time I'm going! It isn't the end. It's a free beginning — the start of my voyage! I've won to my trip — the right of release — beyond the horizon! Oh, you ought to be glad — glad — for my sake!

“Suppose I was to tell you that it's just beauty that's calling me, the beauty of the far off and unknown, the mystery and spell which lures me, the need of freedom of great wide spaces, the joy of wandering on and on----in quest of the secret which is hidden over there----beyond the horizon?”