When you start to do research into gorillas or any kind of apes, if you're going to play them, that's one of the biggest misconceptions. And when I did Kong, you're not doing gorilla movements, you're not doing ape movements, you're looking for a personality. It's like saying okay I'm going to do human movements.

I love, first of all, reading and discovering what the common perception is and then trying to figure out... well, how does your life cross over into that character, or what's an angle on this that might challenge the status quo? It's just a great journey as well as an education. You're constantly being educated - it's like I'm back at school and making up for lost time.

But that's not what an actor does. An actor finds things in the moment with a director and other actors that you don't have time to hand-draw or animate with a computer.

When you have children, you realize that at the end it's all about passing on, about handing down. The process of letting go, not attachment, but appreciating the beauty and value in the change, the transformation.

My sons have to learn that you take the rough with the smooth and they've seen a lot of smooth in the years that they've been around. They didn't see the early years. But both my mum and myself are actors and we constantly tell them it's not easy. But they understand that.

It's a different rhythm than most movies. For a lot of the actors, you're 12,000 miles away from home. It becomes a way of life - getting up at five in the morning, shooting every day, day in day out, for 270 days. The new cast playing the dwarves were carrying incredibly heavy weights in their suits, they sat through hours of make-up every day. So it's quite challenging from a stamina point of view.

I think we can be very narrow-minded in this country; you see something that someone's done and immediately want them to do the same thing again - but if they don't, they're criticised for not doing the same thing again, but if they do they're just repeating themselves.