The plane as an object has been a huge effort to make. It is a sculpture, a technological invention, a piece of aviation culture. But really, it only exists to be inserted into a variety of landscapes, to be a catalyst, to offset them.

Dutch beaches were known to me as man-made territories, as part of various land reclamation projects. But I was also interested in the media reality of the Moon landing. I wanted to use that event as a measure of time, to see what had happened in those thirty years - which happens to be my lifetime as well. I was born in 1967 and I remember seeing the Moon landing on TV when I was two. All those things were in play. Then it became a big production. It took five months to gather up the goodwill and make it happen.

The Stonehenge proposal got a lot of interesting criticism. One of the best - or worst - said something like, "Go home to Las Vegas." I think this project could possibly be realized at a very late part of my career. Right now, I don't have the authority, the budget, the credibility.

National parks, zoos, protected areas, polluted seas - using the whole world as a readymade, I thought about it as a stage set. To activate a stage set you need a drama, an actor to offset it.

People get upset when Baghdad, the "Cradle of Civilization" is burning, or when the Buddhas in Afghanistan are falling. These are real concerns.

In a way I am saying the nation-state doesn't exist, borders don't exist, you can try going anywhere. It is a kind of pre-Internet consensus I always had in me.

I was a lousy academic. I spent most of my time in the cafeteria. But I met fantastic people from all kinds of fields; law, medicine, history, and they eventually dispersed all over the world to do their fieldwork. I liked the way these people committed to the long term in a sincere, visionary way. Their projects weren't about "next season." They were ten-year commitments. They were lifestyle choices that had traditions of fieldwork built into them - moving around, living on location, discipline, a real rigor for research.