What clues do these painting give about the way of life of the old stone age.

They communicated through cave paintings. As we know, most painting were depicted to be animals, though there are few paintings that appear to have human etchings in the paintings. Some believe that they wanted to decorate the cave with the animals that they hunted to pay their respects for sustaining their ability to live. Others inquire that capturing the image of the animal made them believe that they could capture it during the hunt. Painting the animals on the cave could also mean that they were documenting their hunting expeditions.

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.