If you have a vision or if you believe the director has a vision, then at least you've got something to talk about, something to try and head to and I think that's mandatory for every director to have to do a good job.
Ultimately your job as an actor is to perform however you're being asked to perform and there's many different procedures as an actor that you're going to run into that you should be prepared for and be ready to go to work and do the best you can and give the director the best thing you can to hopefully give him things on that day that could be shot preserved and out into a canned, then when they go into the editing room that's where a movie's made.
We all are capable of many different emotions and behaviors and thoughts and abilities and the way we sometimes respond to something is just very, it could be very, very different. You can one day feel this way, and the next day, feel that way.
I hate giving away tricks, you have to create an impression and not an image. You want audiences to look at certain places and not look at other places. And when you've got the help of modern-day abilities with technology, it's a much more natural look.