It's not perfect for his writing - too small, messy, clumsy. He's best with a pencil.
But the vision of his tiny fingers, stained with Parker blue-black; forming loops and lines on paper; pressing hard and skating lightly, twiddling and scratching - it's a marvellous moment.
Damon the writer says: it's the moment of discovery and adventure.
Damon the father says: it's the moment for soap and hot water.
And both smile quietly.