Acting is a way of living out one's insanity.
I always thought that's the exact metaphor, the perfect metaphor for acting. To go blind, to ignore the danger, and to totally trust.
By definition, acting is improvisation, even if you follow the lines. You invent what you do, when you do it.
To me acting and doing movies is really strongly about the present time. It's all about when you do it. It's to create this feeling of extreme awareness and concentration. Because it doesn't happen without an extreme concentration, when you are completely immersed and focused on that.