The meanings attached to what we hold as symbols

Can vary among individuals or groups within a single society, is what we holds as symbols that the meanings is attached. The people or humans have an unlimited capacity to create and manipulate symbols, they are also makes so many ideas to create symbols and it is continuous over time.

Assuming that you're referring to the pictures of tribes men catching fish and fighting each other,

The picture pretty much represent the way they live, and the things they believe is common. They have to hunt for preys to fill their stomach, and fist fights often used to solve problems and disagreements and strengthening the bonds between members