My son is one of those kids that could sit and play. He has always been like that, since he was a baby. We, like most first time parents, didn't allow TV (this has changed, obviously!). Because of this, he was forced to play with his toys. He has always loved things that rolled or had wheels from a young age and to this day still sleeps with about 10 matchbox cars.
These photos are pretty much sum up what my son does everyday. He may be moving rocks from on area to another with his mini loader or he may be lining up all the cars to he can move them along in a very straight line. No matter what the task, he can play for hours while his sister runs this way and that way. I call that focus...and I want more of it for myself!!