As an actor you have to have a strong vivid imagination as you're working and when the camera's rolling, but there's certainly a part of you that is aware of real life, that you're making a movie.
“I remember that I used to mix with my friends who had brothers and sisters. I was an only child.”
“These are excellent lessons to break him, and make him light in hand: but nothing puts a horse so much upon his haunches, and consequently makes him so light in hand, as my new method of the pillar.”