In his book The Soul’s Code, James Hillman writes about the acorn theory of psychology. He sees fundamental, core themes and forces flowing throughout our lives. Those drives define our character, and they constantly call us back to our roots, to our genuine paths. They are the acorns that shape our being as they grow into the oak trees of our lives.
In one of his examples, he describes how the fascination with simple art materials like crayons in our childhood can presage the passion for art in adulthood.