He [Richter's art-mate, the German painter Sigmar Polke] was very different, he was not cool... He had irony. He was very funny. The things we did together [around 1963 – 1970] were a kind of craziness... We thought everything was so stupid and we refused to participate. That was the basis of our understanding.... he was able to paint those little dots in his raster paintings by hand with such a patience while he was living with his two children and his wife in a small subsidized apartment.

pp. 45-46, note 43 - 'Doubt and belief in painting' (2003)