I was inspired to look up the quote:
Critics raved about her face: 'Her face, early called the face of the century, had an extraordinary plasticity, a mirrorlike quality; people could see in it their own conflicts and desires.' People who worked with her noticed that her face didn't change. Robert Taylor said: 'The muscles in her face would not move, and yet her eyes would express exactly what she needed.' Clarence Brown said: 'I have seen her change from love to hate and never alter her facial expression. I would be somewhat unhappy and take the scene again. The expression still would not change. Still unhappy, I would go ahead and say "Print it." And when I looked at the print, there it was. The eyes told it all. Her face wouldn't change but on the screen would be that transition from love to hate.'
Garbo had a stand-in who was identical to her, and who was said to have 'everything that Garbo has except whatever it is Garbo has'. What Garbo had was a body that transmitted and received. It was her spine that should have been raved about: every vertebra alive and separated so that feelings flowed in and out from the centre. She responded spontaneously with emotion and warmth, and what she felt, the audience felt, yet the information transmitted by the body was perceived as emanating from the face. You can watch a marvellous actor from the back of a big theatre, his face just a microdot on the retina, and have the illusion you've seen every tiny expression. Such an actor can make a wooden Mask smile, its carved lips tremble, its painted brows narrow.