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.

But I have a problem with the term 'light'. I never in my life knew what to do with that. I know that people have mentioned on some occasions that 'Richter is all about light', and that 'the paintings have a special light', and I never knew what they were talking about. I was never interested in light. Light is there and you turn it on or you turn it off, with sun or without sun. I don't know what the 'problematic of light' is. I take it as a metaphor for a different quality, which is similarly difficult to describe. Good.

The smudging makes the paintings a bit more complete. When they're not blurred, so many details seem wrong, and the whole thing is wrong too. Then smudging can help make the painting invincible, surreal, more enigmatic - that's how easy it is.

Art is not a substitute religion: it is a religion (in the true sense of the word: 'binding back', 'binding' to the unknowable, transcending reason, transcendent being). But the church is no longer adequate as a means of affording experience of the transcendental, and of making religion real - and so art has been transformed from a means into the sole provider of religion: which means religion itself.

Picturing things, taking a view, is what makes us human; art is making sense and giving shape to that sense. It is like the religious search for God.

It is a danger to wait around for an idea to occur to you. You have to find the idea.

I remember that I felt I had to avoid all these sensational photos, the hanged woman, the man who shot himself, and so forth. I collected a great deal of material, including a number of banal, irrelevant photos, and then in the course of my work I came back to the very pictures I had actually wanted to avoid, which summed up the various stories.