The need to create order
In a child's development, little is more important for their future success than the ability to focus on tasks.  In these examples we see difficult work done for its own sake and the pure joy of the process and product.  It does not need to be pictorial or useful. 

The child enjoys the activity and the product is appropriately rewarding.  Humans have a need to create order.  Art is an appropriate venue in which to nurture it.

Tempera paint on paper
age 3 years 6 months 1963

colored markers
4 years 8 months  1998

to>preschematic picture
to>thinking picture
to>x-ray picture
to>quest for order  See this link for more about this topic and for the source of the concept.
to>scribble information
preschematic information
to>schematic information
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