A deeper truth the camera can see can be more surprising than even the director imagined it could be. That's a wonderful thing that grows and happens in films.

On one occasion, Daniel Day-Lewis, Jeremy Irons and myself were due to appear at the Sarajevo film festival and were turned off a UN plane on orders from Geneva. We had to get local journalists to transport the films in for us. I tell you this only to demonstrate that festivals can be a lifeline. But, after all the difficulties I'd had in getting there, in 1996 I found myself being flown in on a four-seater RAF plane as an official guest, endorsed by the British Embassy. Ironically, the film I was to present was Mission: Impossible.

The great writers like Chekhov know that tragedy and laughter are just a few steps from each other ... but it took me a long time as an actress to learn that. Actually Arthur Miller taught me in the Seventies. We were making a CBS TV drama of his play Playing for Time about Auschwitz but the characters were laughing. It was a big insight for me to realise that that was what's called gallows humour, in this case worse than the gallows, that humans need to laugh and make jokes in order to survive.

When somebody can't reveal what they're after - whether by word or by how the camera is set up, lighting, etcetera - it's like an electronic beep beep; it interferes very much with what we actors can do. And, after all, the director wants the actors to be bringing forth the best that they can, according to whatever vision he has.

Shakespeare lets us see real people undergoing real processes, with real feelings

One of the joys of cinema is that, given the right circumstances, and the genius director, an incredibly wonderfully actor can become the embodiment of his character.

One must never comment as an actor, never show that a character is shallow or vindictive, but let that be conveyed. I mean, none of us thinks of ourselves as being vindictive or shallow - perhaps we should.