Rock maps & runes, caveman cartoons, or art w/ intentions of leaving a story to read 1,000s of years later. Why?

Communicating our lives for others to see one day seems to go back to every millennium of mankind on the Earth. What are the symbols? What do they mean?

Who interprets what the words or runes Wii write while wii are here? How do they know the sounds that will impress upon us one day from symbols carved in rock with a message I can’t say? What if the rest of this were here, the other parts warn off still evident, and paths to other parts where they had their gardens and lairs? Who would do this on a rock…