On the one hand I follow a vocation because I have an ability that I should exercise, but I want to use it for a reason, because I don't see that the freedoms that I enjoy are God-given realities. So I have a very healthy, activist general tension in me which feels that no, this is not gratuitous, it is important to keep this in focus.

Whatever pictures are put into the world, the balance needs to be readdressed, it needs to be observed. That's why I am also really questioning what a lot of photography has done since I began. I am not saying because of me, but I mean, photographing some friends partying and publishing the pictures meant something else in '92 than it does in 2011. And I find the younger generation is not questioning this at all today.

For me, a good portrait shows the fragility and humility of the person, and at the same time a strength, a resting in themselves.

I heard this wonderful quote - "Only the brave show what they love." It's so-embarrassing to approach somebody and say you want to look at them. But without that risk taking, nothing can happen, so I have to make myself vulnerable. What I think is the unifying aspect in people that I like is that they have a sense of their own vulnerability, and I respond to that.

This ongoing coexistence which makes life sensational. The eyes have this ability to flip around what they see from one second to another, to see something as an object, and then as a design. That's really liberating, and I try to convey that in my work, that your eyes are free and you are free to use them.

This coincided with the fall of the Berlin Wall and Europe coming closer together, and nightlife and techno and ecstasy culture seemed like a very powerful panEuropean movement.

It would be so easy to lose the plot now. It's not about achieving something for its own sake, and taking pictures for their own sake. But to make conscious decisions and choices, and it includes this constant questioning - Why am I taking pictures? Because really, the world is... it has pictures enough. I mean, there are enough pictures out there.