Sometimes "Top n" lists are lame, but not always, especially when they detail some of the most spectacular ancient cave art ever found. From reading books and seeing some documentaries, the ancient artists utilized the shapes of the cavern walls themselves to enhance their creations, giving them an even greater "presence" than you get from seeing them in pictures.

Not to mention the fact that, when they were composed, the artist was painting in near complete darkness, and likely couldn't see the entire composition at one time.