How difficult was it creating a character who has no physical presence?

Very. As the film progressed, from an emotional stand point, I started to feel like I was more of a puppet than an actor. I had a hard time trusting that what I was doing, the fruits of my labour, would be seen.

How did you cope?

I kept a diary. It was my publicist's idea. I'd never written anything before. I found it to be a great therapeutic tool because I don't complain. I'm not a complainer. I'm a sit-it-out and get-it-done kinda guy. I was able to use this diary as a therapist. I could write all my thoughts, feelings of frustration, loneliness and isolation.

How do you prioritise between work and family when you're on a long shoot like "Hollow Man"?

There's no comparison when it comes to priorities in my life. We have a two week rule as a family, where we try to get to each other every two weeks wherever we are. Many times on Friday night, I'd sit there on the set hoping I could wrap by ten o'clock in order to make it to the airport to catch a red-eye to New York and spend 24 hours at home. That takes its toll on the family.

What have you done since "The Hollow Man"?

I've just shot two days on Steve Martin's film "Novocaine". I'm playing an actor, which is really fun because I got a chance to sit and make fun of myself.