I just happen to be such a self-confident proletarian, you know, that I say: 'I'm going to do that! You can say what you want.' I don't know myself what that's good for. But I do it. Because I know ...

by Sir Stanley Spencer and ‘Self-Portrait with Badges’ (1961) by Peter Blake. Trench Warfare (1932) by Otto Dix and Guernica (1937) by Pablo Picasso are both paintings on the theme of war.