Yesterday ds2 (6) spent virtually the entire day on his own building a Lego Pirate ship.
Then today he spent about 5 hours alone building a huge motorised fairground ride out of K'nex.
He never comes to ask for help. If he loses a bit, he spends ages looking for it; or devises a way of using a substitute. If something doesn't quite work, he constructs a cunning alternative design ...
We are only required to come when summonsed to the grand reveal, and ooh and aah at appropriate places
DS1 is much more demanding of attention and time, no matter what it is he's doing.