Ars Poetica Archibald MacLeish A poem should be palpable and mute As a globed fruit, Dumb As old medallions to the thumb, Silent as the sleeve-worn stone Of casement ledges where the moss has grownㅡ A poem should be wordless As the flight of birds. A poem should be motionless in time. As the moon climbs, Leaving, as the moon releases Twig by twig the night-entangled trees, Leaving, as the moon ..