And here we see the invisible boy
In his lovely invisible house,
Feeding a piece of invisible cheese
To a little invisible mouse.
Oh, what a beautiful picture to see!
Will you draw an invisible picture for me?
Shel Silverstein
I read this poem to the girls today, and then we read it again and again. It took several readings for them to 'get' it. But when they did, my girls giggled and giggled and we spent all afternoon with a blank piece of paper drawing mice, people, houses and words.
The simplest of art.