OT, and tardy to boot, but your comment reminds me of the only song I know about cave painting, "The Caves of Altamira", by Steely Dan:
http://www.youtube.com/watch?v=mBCa9WPHlWI
"Before the Fall, when they wrote it on the wall, and there wasn't even any Hollywood..."
Fair enough.
> Further, the "intention of the artist" is completely lost if there is no explanation, and the work is shown in a gallery without context.
However, some of the strongest form of art today (prehistoric cave painting) have lost all of their context and hope of being understood. I think we can manage without any explanation most of the time.