Anecdotally, last night, DS9 told me that when he's not actively doing something like reading or writing, such as when he's just playing a board game with the family, he's always imagining things. Like he pictures us as Transformers (he watches the 80s cartoons) going into battle and he plays out the whole scene and actions in his head. He said it's like a little video clip he turns on and off. I think one of my favorite things about watching my kids at this age is remembering how vivid my imagination was when I was younger. Seriously dynamic. I wish I'd kept journals that young. I don't go into the zone as much any more, but I have been able to zone out as well as focus seriously intensely so that I'd lose track of all time in a project.