Throughout the film, audiences will never see the actor’s face, and Weaving said that playing the character in mask, “is a technical exercise, and then it became something slightly different so that was pretty interesting. Still I think we were still trying to go through a performance and that was very important because ultimately I realised, well the performance did start to bring the character to life, and initially I was thinking much more in terms of the outward effect and, well if I do this or if I do that. I mean the mask is still like that or that or if I do certain things and punctuate certain words with certain movements, then that will animate it. And it did to a point and then the more I did it, the more I forgot about those tiny little movements and the move the performance started doing those things for me.”
You can read the full interview at the link above.
Source: Dark Horizons