Why are these 32 symbols found in caves all over Europe?

Below is a very interesting Ted Talk from, Genevieve von Petzinger, on a set of human-created symbols that have been found in caves all over Europe. This very much relates to the fact that human beings are natural-born storytellers and we create narratives, meanings and stories in our lives to help us understand it and make sense of it. For some further insights into this please see the post on humans are natural-born storytellers

Ted Talks Description:

Written language, the hallmark of human civilization, didn’t just suddenly appear one day. Thousands of years before the first fully developed writing systems, our ancestors scrawled geometric signs across the walls of the caves they sheltered in. Paleoanthropologist and rock art researcher Genevieve von Petzinger has studied and codified these ancient markings in caves across Europe. The uniformity of her findings suggest that graphic communication, and the ability to preserve and transmit messages beyond a single moment in time, may be much older than we think.