[Mathew]

How do you know what their intentions were?

And what is the ideal?

Jack Nicklaus - chapter 6 of Golf My Way - "I regard keeping the head very steady, if not absolutely stock still, throughout the swing as the bedrock fundamental of golf. It is inviolable as far as I'm concerned" - italics on "the" is his...

Ben Hogan - Chapter 5 Power Golf- "The body only coils. Your head doesn't move" when describing his backstroke mechanics on p53 and then on p68 describing a frame pre-impact - "The head is still stationary"...

Look at my signature on what Bobby Jones thought....

and thats just three great players... I got alot more quotes too but I think you get my point.

The ideal is to use your eyes inorder to detect any wrongful deviation in head location. There is no control for the point between the shoulders, which is why Homer Kelley didn't advocate it.

So, if the head were shaped like a soccer ball the perceived movement to the right would not exist...explain this to me.

Well think about it - if the head is in a fixed point in space and it turns slightly, how would it look to a camera face on....

Which particular point?...the base of the neck?

I prefer describing that point as the point between the shoulders - but close enough.