Well, he rolled over, it amounts to the same thing.
Once on Monday. He couldn't get back again. Stuck on his stomach.
Tuesday he rolled back again. Technique improving.
Today, three consecutive rolls in one direction. If I don't keep an eye on him, he'll be in the next room.
I wonder if primitive man thought of the wheel when watching his babies roll around on the floor of the cave on those nice soft bearskins.