The human inadequacy of geniuses, which he brings us closer and makes more bearable, is wonderfully recorded by Daniel Kehlmann.

My teacher Istvan Szabo once said to me: Never make a film of a good novel, always only a novel with a good idea, because you can never do justice to a good novel.

We tried anyway, together, and Daniel liked the film, especially the 3-D idea.

When Humboldt's life story was filmed, we were with a 180-man team in the jungle of Ecuador. The Huaoranis had come to us from the reservation and for budget reasons I only had one day to film.