The interesting thing with child actors is that kids are natural actors. They're wonderful actors, and most kids are acting all the time. They're imagining they're out in the yard playing. They're imagining that things happened, and they can get very vivid.
I learned from Seurat this important thing about colour and light, that 'a light' can be built from colour. I learned a great deal about interaction, that 'a blue' in different parts will play all sorts of different roles.