Panel of horses in the Chauvet Cave, France. One theory is that this depicts the same horse, but at different ages - as a foal in the lower right, then a young horse, then a mature horse, then an older horse. In other words, the drawing shows a horse moving through time, not space. It could also depict a herd of horses or a family. Extraordinary, and as fresh today as it was 32,000 years ago.