Each museum is different - the collection is different, the context is different, the relationship between the art and architecture is different.

One of the real challenges, since we're working in so many places - Mexico, Japan, Brazil - is understanding variations, both in terms of culture and context.

I was in Taiwan recently and was completely amazed by the density of population. It makes New York look like no one is out on the streets.

Whiteness allows the architectural ideas to be understood most clearly - the difference between opacity and transparency, solid and void, structure and surface. These things are more perceptible in a white environment. They have a greater clarity.

Ultimately it's the public nature of those projects that I most enjoy. Museums are more than just places to view art, they're also civic and social centers.

Any work of architecture that has with it some discussion, some polemic, I think is good. It shows that people are interested, people are involved.

Rome has not seen a modern building in more than half a century. It is a city frozen in time.