Perhaps the choice is a negative one, in that I was trying to avoid everything that touched on well-known issues - or any issues at all, whether painterly, social or aesthetic. I tried to find nothing too explicit, hence all the banal subjects; and then, again, I tried to avoid letting the banal turn into my issue and my trademark. So it's all evasive action, in a way.

I'm trying to paint a picture of what I have seen and what moved me, as well as I can. That's all.

The first colour charts were unsystematic. They were based directly on commercial colour samples. They were still related to Pop Art. In the canvases that followed, the colours were chosen arbitrarily and drawn by chance. Then, 180 tones were mixed according to a given system and drawn by chance to make four variations of 180 tones. But after that the number 180 seemed too arbitrary to me, so I developed a system based on a number of rigorously defined tones and proportions.

Painting pictures is simply the official, the daily work, the profession, and in the case of the watercolours I can sooner afford to follow my mood, my spirits.

There was no special event that made me decide. I had collected some photos and the idea was in the back of my mind for a long time. It was growing and growing, so finally I said, 'I must paint this.' I come from East Germany and am not a Marxist, so of course at the time I had no sympathy for the ideas, or for the ideology that these people represented. I couldn't understand, but I was still impressed. Like everyone, I was touched. It was an exceptional moment for Germany.

I started doing 'figures', then, one day, all of a sudden, I started doing abstraction. And then I started doing both. But it was never really a conscious decision. It was simply a question of desire. In fact, I really prefer making figurative work, but the figure is difficult. So to work around the difficulty I take a break and paint abstractly. Which I really like, by the way, because it allows me to make beautiful paintings.

The photograph is the only picture that can truly convey information, even if it is technically faulty and the object can barely be identified. A painting of a murder is of no interest whatever; but a photograph of a murder fascinates everyone.