There is a magic thing called 'tone' in a film, that the director must master and maintain.

It is really hard when the actor you pictured can't do the film.

I think one of the great joys of being a writer is you can transcend everything, even your own sex, what century you live in, and how you think. I found it quite natural to think as a male because I actually think that as a female, one often thinks in the mind of a male in terms of eroticism. You think about what the other person feels. So it's not that hard to imagine being that person.

The script is the musical score, and everyone has to play off that score. Even I have to interpret it. The producers are there to eliminate obstacles to that interpretation.

When I left university I was sure that I was going to be a painter. Then I had a crisis, a revelation. I saw Dolce Vita and my mind was blown by it, by the synthesis. I realised I wanted to be a filmmaker and started making films. I was writing screenplays and couldn't get money because my work was so uncommercial. I got married and started writing fiction. What was wonderful is that it gave me my freedom because no-one can tell me I can't work. Novels have become equally important to me as films. I consider myself a storyteller and passionately engaged in both of those disciplines.

I think it's very important to keep being frightened - if you're not frightening yourself, you should take a break. You need to keep experimenting. You also need to take time - that's how you do good stuff - layering and depth of knowledge.

Writing is a particular kind of frustration, which is why when I was making the structure for the novel I visualized it for myself with a color-coded board so I could see it.