Anthony Caro wanted to avoid material, to have no material at all. So you can paint sculpture and sculpture can still become a painting, but you cannot deny your knowledge of things and turn iron into pure colour. I have nearly an archaeological attitude in this regard. When I was young for example, I also used to make mosaics, affixing the tiny pieces together. Later when I had the exhibitions in Haus Krefeld this was again the point: how to make a sculpture where the material is still present (fig. 13).