War may be terrible, but it’s good for art, writes Jan Dalley. The 20th Century “produced in the western world a rich array of art inspired by war, and invented or exploited new art forms with which artists of all sorts could express their responses. War is, let’s face it, a great subject. And once the subject was liberated from the constraints of previous centuries – that was, the adherence to right-thinking patriotic norms that demanded unconditional and uncritical support (“my country right or wrong”) – there was a flowering of art in response to conflict.”