The works of Friedrich differ greatly from those of other landscape painters in their motifs. The air - even though he paints it masterfully - takes up more than half of the space in most of his compositions. Middle- and background are often missing because his motifs don't require them. He likes to paint unfathomable plains. He is faithful to nature even in the smallest details and he has mastered his technique - in his oil paintings and sepia drawings - to perfection. His landscapes contain a melancholy, mysteriously religious meaning. They affect the heart more than the eye.