‘I should like,’ Edgar Degas once remarked, ‘to be famous and unknown.’ On the whole, he managed to achieve this. Degas is after all one of the greatest names in European art, but there is much about him that remains enigmatic. Some of his works seem secretive, even surreptitious — the extraordinary monotypes he made in Parisian brothels, for example, or the many wax sculptures he created but neither cast nor exhibited.