Art should be serious, not a joke. I dont like to laugh about art.

In 1981, I think, for the Kunsthalle in Düsseldorf. Before that I designed a mirror room for Kasper König's Westkunst show, but it was never built. All that exists is the design - four mirrors for one room.

I first came up with the idea for the colour-chart pictures back in 1966, and my preoccupation with the topic culminated in 1974 with a painting that consisted of 4,096 colour fields. Initially I was attracted by the typical Pop Art aestheticism of using standard colour-sample cards; I preferred the unartistic, tasteful and secular illustration of the different tones to the paintings of Albers, Bill, Calderara, Lohse, etc.

Talk about painting: there's no point. By conveying a thing through the medium of language, you change it. You construct qualities that can be said, and you leave out the ones that can't be said but are always the most important.

To talk about paintings is not only difficult but perhaps pointless too. You can only express in words what words are capable of expressing-- what language can communicate. Painting has nothing to do with that.

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.

I don't believe in the reality of painting, so I use different styles like clothes: it's a way to disguise myself.