Practice for the mind is meditation. Happy in what they do. Training efforts. Training delicate minds. Trained sensory link between the shape (sight) with the idea.
There may also be other advantages too .
For children .. that would be useful . It is a meditation for him. Do not worry about ADHD. It is one thing to be careful . We find that he wants to do . Not to force him. If forced to . Meditation instead . Turns out he was boredom. No interest in the rough resolution as ADHD, there is a wrong way for his attention . Or would like to get a picture .