Children's Art: Drawing in the sand

When I came to the school yesterday at noon to pick up our children, I found to very sweet little first grades sitting in the sand infront of the bicycle rack. They drew with their fingers in the sand and the regularity of the pattern caughted my eye.
When I asked them what they are doing, they told me, that they visited an art exhibition with their class that day and that they wanted to draw and make art themselves now.....
I simply love the idea, that children are so touched by art that they try it out themselves :-)