In the past Berlin was much more radical and extreme and now it's becoming much more of a conventional European city.

It would be wrong to say that the city of Berlin is not regulated. What I think is more interesting is to what extent a city creates a sort of safe haven for its users, so that people feel confident that the city works on their behalf.

I myself have already spent a third of my life in Germany, first in Cologne and then, since 1994, in Berlin.

Every city is always changing, on its own trajectory.

It's hardly even noticeable that so many artists, designers and architects live here. It isn't reflected in the cityscape or in the museums. Many of the artists, for example, exhibit around the world, just not in Berlin.

I was in Beijing a month ago working on the smoke project in collaboration with an architect there, and I was asked very directly whether it was safe to breathe in the smoke. They did not have confidence in the museum not to use harmful smoke, and they certainly didn't have confidence that the city would protect them from harmful smoke.