It was not possible for us to produce the same optimism and the same kind of humour or irony. Actually, it was not irony. Lichtenstein is not ironic but he does have a special kind of humour. That's how I could describe it: humour and optimism. For Polke and me, everything was more fragmented. But how it was broken up is hard to describe.

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.

And then the work bears a strong sense of leave-taking for me personally. It ends the work I began in the 1960s (paintings from black-and-white photographs), with a compressed summation that precludes any possible continuation. And so it is a leave-taking from thoughts and feelings of my own on a very basic level. Not that this is a deliberate act, of course; it is a quasi-automatic sequence of disintegration and reformation which I can perceive, as always, only in retrospect.

As I see it, all of them - Tachists, Action Painters, Informel artists, and the rest - are only part of an Informel movement that covers a lot of other things as well. I think there's an Informel element in Beuys, as well; but it all began with Duchamp and chance, or with Mondrian, or with the Impressionists. The Informel is the opposite of the constructional quality of classicism - the age of kings, or clearly formed hierarchies.

The reason these paintings are destined for New York is not because I am disappointed about a lack of German interest, but because MoMA asked me, and because I consider it to be the best museum in the world.

Everything has a reason, including the selection of the photos, which was not arbitrary but appropriate to the period, its highs and lows and my sense of them.

My method is related to an attempt to do something that might be understood by today's world, or that could at least provide understanding. In other words, doing something I understand and that everyone understands. This natural desire for communication is also found in other domains, like reading and discourse, etc. I also hate repeating myself; it gives me no pleasure whatsoever. Once I've understood something, I need to start off on new ground.