Most old cities are now sclerotic machines that dispense known qualities in ever-greater quantities, instead of laboratories of the uncertain. Only the skyscraper offers business the wide-open spaces of a man-made Wild West, a frontier in the sky.

In this branch of utopian real estate, architecture is no longer the art of designing buildings so much as the brutal skyward extrusion of whatever site the developer has managed to assemble.

Nigeria [in 1990] was all rumour, an unbelievable amount of rumour - largely about crime and almost mythical manifestations of evil.

But now sustainability is such a political category that it's getting more and more difficult to think about it in a serious way. Sustainability has become an ornament.

I think one of the important evolutions is that we no longer feel compulsively the need to argue, or to justify things on a kind of rational level. We are much more willing to admit that certain things are completely instinctive and others are really intellectual.

The thing is that I have a really intense, almost compulsive need to record. But it doesn't end there, because what I record is somehow transformed into a creative thing. There is a continuity. Recording is the beginning of a conceptual production. I am somehow collapsing the two - recording and producing - into a single event.

Journalists seem mostly interested in what brand of shoes I wear.