In responce to the title... neither art nor crime, just scribbles ;) or yes maybe crime, in a sense I assume a kid would think "mom would ground me forever if I did that to the walls of my room"
Oh! Sooo lovely!! And it includes a question that gets one thinking. Reflecting back many years ago, I would have absorbed the warmth, color and design of the walls. At that age, "crime' wasn't in my vocabulary. Shu