Sustainability has become an ornament.

Nigeria was a blank on the map - there weren't even any maps. The US State Department, everyone said don't go there. It was courageous of Harvard University: the notion was that we would match Harvard students with Nigerian students, so that every student would have a guide, creating a guarantee of intimacy with the city.

I studied in London in 1968. Our school had a separate department of tropical architecture. Of course it was totally unfashionable, partly because nobody wanted to think about colonialism, but basically what you learned there was that, OK, the sun is here, so you should create natural ventilation here - an unbelievable amount of really sound principles that have been completely abandoned, so now everything is air conditioned with big machines.

Let's put it this way: One can be happy or unhappy in a building. But some buildings make us more depressed than others.

Japan lives with drastic segregation between the sublime, the ugly, and the utterly without qualities. Dominance of the last 2 categories makes mere presence of the first stunning: when beauty 'happens', it is absolutely surprising.

The areas of consensus shift unbelievably fast; the bubbles of certainty are constantly exploding.

It was a book [George Packer written on our presence in Nigeria] that was killed by the response of other people. Which sounds quite cowardly, perhaps, but it was the first manifestation of what is currently a really big issue: how political correctness defines the limits of what you can do. In that sense, it was super-exciting and maybe the most magical project we did, but at the same time fraught with mixed feelings.