A city is a place that can offer maximum freedom. Otherwise it’s incomplete.

Artists are the worst [people]. They are selfish, self-centred; they don't care what happens.

I see the Beijing National Stadium as an architectural project. I accepted Herzog and De Meuron's invitation to collaborate on the design, and our proposal won the competition. From beginning to end, I stayed with the project. I am committed to fostering relationships between a city and its architecture.

We move so fast that memory is something we can only grasp

The idea to use backpacks came from my visit to Sichuan after the earthquake in May 2008. During the earthquake many schools collapsed. Thousands of young students lost their lives, and you could see bags and study material everywhere. Then you realize individual life, media, and the lives of the students are serving very different purposes. The lives of the students disappeared within the state propaganda, and very soon everybody will forget everything.

China didn't want to lose the cutting edge of technology. So the idea of having a Sina Weibo was an attempt to compete with Twitter. However, it has no soul - which is freedom of expression. Nevertheless, I think the government regrets having Sina Weibo, but they cannot shut it down. That would definitely be suicidal.

How to become a really modern society when today we are so - as a human being, we feel so powerful. We have high technology and a superb way of controlling our life. And at the same time, in many ways we are so primitive. We are not on - even just a step away from the most brutal and primitive crudity. To be very crude on those issues, which is always challenges and we always have to look at the situation like a mirror, to draw some understanding.