Alan Rickman has a huge presence in the Perfume: The Story Of A Murderer and takes an enormous amount of space with no effort. I wanted somebody to leave behind a strong impact and be a threat for Grenouille. When Alan takes to the screen, we immediately know there's an intelligent, instinctive and powerful force, so if he's pursuing our main guy then our main guy is in trouble.

I actually met a producer of Stanley Kubrick's who told me that Kubrick had never even thought about doing Perfume: The Story Of A Murderer. He just read it and didn't want to do it - that's it. There's a myth around that he said it's not filmable. But he never wanted to film it.

With Dustin Hoffman, I just enjoyed the fact he was this flamboyent and very ironic person that still followed my desire to make Baldini in the Perfume: The Story Of A Murderer not simply a joke, or the funny guy, but also a personality and a character.

I was lucky I guess. My main job was done when I finally found Ben Whishaw and knew that there was someone who could portray a character who was so ambiguous and multi-faceted. Ben is equally dark and innocent; potentially violent and yet at the same time kind of a boy. He got all that across and still makes audiences root for the guy even though they might be kind of disturbed by that fact.

I love that contradiction between the ugly and the nice. It's shot in a very gourmet way in the Perfume: The Story Of A Murderer. But then Grenouille doesn't differentiate between what's commonly considered to be good smells and bad. He just takes it all, like a true collector does.

Alan Rickman has a huge presence in the Perfume: The Story Of A Murderer and takes an enormous amount of space with no effort. I wanted somebody to leave behind a strong impact and be a threat for Grenouille. When Alan takes to the screen, we immediately know there's an intelligent, instinctive and powerful force, so if he's pursuing our main guy then our main guy is in trouble.

If you then cast a somebody, playing a nobody is always an additional effort. But that was not the reason we cast him. It was because Ben Whishaw delivered exactly what I was hoping for.