The Warring States period was a time of bloody conquest in Japan. Its final battle, is depicted in astonishing detail in "The Siege of Osaka" folding screen. Other such screens only feature samurai, but this one is different. It contains images of suffering; graphic depictions of theft, rape and abduction that can be hard to look at. Who painted it? And why? Professor Frederik Cryns, expert in the history of the period, uncovers the secrets of this unique work of art.