I'm sure there were marks on the table showing exactly where to position it at each pause. (Yep, as axx points out, you can see him check the base on the table before turning.) It's that kind of production. People physically present in the audience obviously get varying angles, but unless he is panning it around for everyone you can be sure it is planned for the camera.
Ok, got the keynote downloaded. My memory is off. He doesn't pause at exactly a side view. He passes through it twice, and the split screen shows the bulge pretty well, when they are showing the side, but obviously a viewer's attention could be on the other half of the split.
To my additional surprise, the first glory shot of the thin edge does show about half of the bulge. He could easily have stopped a few degrees sooner and shown no bulge. I wonder if that gives the viewer the belief that the bulge is much smaller than it is. That may be reading too much in.
Ok, got the keynote downloaded. My memory is off. He doesn't pause at exactly a side view. He passes through it twice, and the split screen shows the bulge pretty well, when they are showing the side, but obviously a viewer's attention could be on the other half of the split.
To my additional surprise, the first glory shot of the thin edge does show about half of the bulge. He could easily have stopped a few degrees sooner and shown no bulge. I wonder if that gives the viewer the belief that the bulge is much smaller than it is. That may be reading too much in.