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 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.

How could one be in this world without feeling dismayed by it? Even if one paints flowers and gingerbread.

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.

The grey is certainly inspired by the photo-paintings, and, of course, it's related to the fact that I think grey is an important colour - the ideal colour for indifference, fence-sitting, keeping quiet, despair. In other words, for states of being and situations that affect one, and for which one would like to find a visual expression.

I do not mistrust reality, of which I know next to nothing, but I am suspicious regarding the image of reality which our senses convey to us, and which is incomplete and limited. Our eyes have developed such as to survive. It is merely coincidence that we can see stars with them, as well.

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