The Early Communications

I would have to say that the topic we studied in class today would have to obviously be about early communications. We especially went into detail about cave paintings and looked at paintings from millions of years ago. Most of the paintings were just of pictures, and everyone had different depictions of what they meant. Before we actually went into more detail about the paintings we went downstairs to try our own. This was fun, yet challenging. I think what I learned most out of this was that symbols and pictures can be taken many different ways. I had fun being hands on and thinking of ways to show our sentence. A lot of effort and thought had to go into these otherwise people would not have understood what you were trying to show.
My question would have to be did other people during the cave painting times understand what one groups pictures were trying to say? Or did the pictures and symbols just vary group by group?