Why did primitive people use the walls of their caves for paintings?

Primitive people used the walls of their caves for paintings as a means of expression, communication, and record-keeping. These artworks often depicted hunting scenes, animals, and rituals, serving both a practical purpose in spiritual or hunting contexts and a social function in conveying shared experiences. Additionally, the caves provided a durable surface that protected the artwork from the elements, allowing these early humans to leave a lasting mark of their existence and beliefs.