You try to imagine what that war was like, but with that period neither photography nor accounts really ever captured the horror. For me it was art, and all sides of that art, of people trying to depict the undepictable, that perhaps came closest. When I was studying art history, I always found the turn of the century - the 19th century into 20th, whether in France or Britain - riveting. You know the world had changed, and while the world was changing, art was as well. 

War Art with Eddie Redmayne airs on May 24th at 22:15 on ITV.