Will Smith, on the importance of acting to an "X"

Fast forward to around 8:37 to hear James Lipton & Will Smith talk about the importance of “Acting to an X.”  Green screen and special effects work are reaction shot acting moments at their best…

http://youtu.be/XeYYnPqlVKM

(Inside the Actor's Studio specifically requested that the embedding feature be disabled, so you'll have to go to the link directly.)