The most unusual picture in the exhibition of work by Eric Ravilious at Dulwich Picture Gallery, in terms of subject-matter at least, is entitled ‘Bomb Defusing Equipment’. In other ways — crisp linear precision, a designer’s eye for the melodious arrangement of shapes — it is typical of Ravilious. Characteristic, too, is the way he has given these implements associated with warfare and high explosives an almost jaunty air, shading into melancholy mysteriousness.