No graphic object is isolated. The more "natural" is appears, the more culturally indicative it is

a stone wheel, Mesopotamia

Venus of Dolci Vestonice (11 cm) from upper paleolithic (circa 80,000 BC)

The point is that objects belong in a time and space. 

The venus of Vestonice is not a "venus" in our modern sense. It's a female symbol of fertility that upper Paleolithic people used. 

 

Pregnant women would touch it, believing it would ensure many healthy births. 

It was not art. It was magic. 

We have to understand history to understand its use and form.

Same with these masks:

oldest known masks (9,000 BC), late Neolithic

People wore masks for ritual ceremonies. Today, we hang them on a wall.

Why do we use them?

Masks are primarily associated with ceremonies that have religious and social significance or are concerned with funerary customs, fertility rites, or the curing of sickness. Other masks are used on festive occasions or to portray characters in a dramatic performance and in reenactments of mythological events. Masks are also used for warfare and as protective devices in particular activities or during inclement weather. (Britannica)