When we visit art galleries or learn about art in school, we tend to think of paintings on canvas, sculpture or photographs. Often these will be clearly recognisable as people or objects like food and flowers, and we can relate to them as familiar in some way.
Art and pictures have been around ever since people first were recognised as human by historians, in pre-historic times. Prehistoric simply means history which dates before written accounts are available to study. The earliest humans did not have writing with which they could communicate and this means that art and pictures were even more important to them.