Well, the biggest documentary project that I was ever involved in was this Canadian film, Labyrinth, that I already mentioned, which was a multi-screen thing for the 1967 Montreal Exposition, World Exposition. And that was filmed all over the world in many different countries. In the whole of 1965... I was working for the Canadians for that project through nine months of 1965. We started in Montreal where we spent hours and hours preparing. They had an experimental setup set up there with the multi-screen theatre form, which was a cross form. There were five academy format screens in a cross format. One, two, three, four, five. And they had taken an old National Film Board of Canada film and they had re-edited it for five screens. And that was very interesting and it taught me the difference between seeing things sequentially and seeing things simultaneously. There's a big difference.

For instance, if you inter-cut a baby crying into the middle of a war scene with canons firing, you think, oh you know this is a bit... what would you say? Naff, a bit naff, let's say. If, on the other hand, you have a war scene playing on four screens and on the fifth screen you hold, throughout all these battles, you hold a shot of a baby crying, that has a completely different effect, and is much more subtle, much more subtle. So that taught me a lot. Then we went all over the world. We went to England, we went to Greece, we went to Cambodia, we went to India, although we didn't shoot in India because the Indo-Pakistani war broke out and we had to move on. But it was one of those occasions when... Ethiopia we went to. It was one of those occasions when I'm aware of... you become conscious of the fact that how lucky you are to be working in this kind of work, where your work takes you all over the world, to many interesting places, like Angkor Wat which I had the chance to see before it was all half destroyed. You have the chance to see all these wonderful places, and somebody else is paying the bills. It's a wonderful opportunity. And the Labyrinth project itself, when it finally reached Expo, when it was edited and finished, it had the biggest queue. There were queues round that building throughout the entire run of Expo, and it took an average of four and a half hours to get in, once you joined the queue. And I said, 'Not even... not for the second coming would I wait four and a half hours'.