I wouldn't mind if the color changed with the day. Or if, for example, Ness and his sister left and returned at school to and from school on weekdays, and his mom left for errands at randomized times during the day, or they all went out together on occasion, or things like that. Maybe leaving and not coming back for a few days, during Spring break, and stuff. Sort of randomized.
Maybe Ness going for night walks, on occasion.