What is Invisible, Organic, Persistent?

Today we had one of those lovely moments where that invisible, organic and persistent thing gives evidence of itself............ what is it?
A child's learning!
We were visiting Great Nana, and Ds 6y 11m who is, as yet a non-reader, picked up a magnetic drawing board and wrote clearly with perfect spelling "Reuben loves Great Nana" then he gave it to her, she read it and thought it was so special. She didn't know quite how "extra special" it was; I thought that if she knew he doesn't yet read, the focus would turn to negative instead of special, as so many people don't understand the concept of trusting a child will learn when they are ready....... but I was rejoicing at both the beautiful sentimental exchange between Great Grandson and Great Nana, and at the evidence of his autonomous learning.

Here's a little look at his natural mode, If there's anything that crosses the boundary between excitement and daredevil, Reuben won't be far away.

Upside down on the flying fox, with his friend watching, taken at recent unschoolers day at an inner city park, that I co-ordinated .