Orson Welles, one of the best of the best. One of the strongest. As strong as an animal. He somehow was pushed out of the business because he would spend the entire budget of the film before he had even done half the pre-production.

The paintings are not just on flat walls - you have these enormous niches, bulges and protrusions, as well as stalactites and stalagmites. The effect of the three-dimensionality is phenomenal. It's a real drama which the artists of the time understood, and they used it for the drama of their paintings.

Martin Luther was asked, what would you do if tomorrow the world would come to an end, and he said, 'I would plant an apple tree today.' This is a real good answer. I would start shooting a movie.

The danger is to stupidly believe that depicting facts gives us much insight. If facts were the only thing that counted, the telephone directory would be the book of books.

[Tim White] always spoke about his work in terms of forensics, as if he was investigating a crime scene. While we were there, they found the fossilized excrement of a lion that had turned into stone, and we would immediately start to concoct stories. Was it a lion that killed the early human? Of course, the lion could've been there three weeks later, or maybe 20,000 years earlier.

I always felt completely confident - it's like in a feature film, knowing your principle character is extremely well-cast. I had that same confidence in Clive [Oppenheimer].

You have to be very prudent with what you are doing and what sort of tools you are utilizing. Drones have become a wonderful new tool in filmmaking.