This week Simon has figured out how to roll.  At first it took quite a bit of effort to roll then prop himself on his elbows to look around.  There was a lot of determined grunting. But now he is rolling from his back to his belly and back over, usually with a good long pause propped on his elbows to survey his surroundings.

In fact, he's had so much practise that he now quickly flips from his back to his belly.  And he props himself up and looks around for several minutes before he tries to scoot forward. 
We are entertained by watching him look around and enjoy his surroundings and by discovering how determined he is.