Interesting article from
http://www.newscientist.com :
"The first intrepid explorers to brave the 7-metre crawl through a perilously narrow tunnel leading to the Chauvet caves in southern France were rewarded with magnificent artwork to rival any modern composition. ... the paintings depict a troupe of majestic horses in deep colours, above a pair of boisterous rhinos in the midst of a fight. To the left, they found the beautiful rendering of a herd of prehistoric cows. "The horse heads just seem to leap out of the wall towards you," says Jean Clottes, former director of scientific research at the caves and one of the few people to see the paintings with his own eyes.
When faced with such spectacular beauty, who could blame the visiting anthropologists for largely ignoring the modest semicircles, lines and zigzags also marked on the walls? Yet dismissing them has proved to be something of a mistake. The latest research has shown that, far from being doodles, the marks are in fact highly symbolic, forming a written "code" that was familiar to all of the prehistoric tribes around France and possibly beyond. Indeed, these unprepossessing shapes may be just as remarkable as the paintings of trotting horses and tussling rhinos, providing a snapshot into humankind's first steps towards symbolism and writing."
Finish each day and be done with it. You have done what you could. Some blunders and absurdities have crept in. Forget them...Tomorrow is a New Day. Emerson.