"In this image, from the Folio Society's Irish Myths and Legends series, two men fight a great battle. They take every shape: 'They began young like two little boys, and fought till they were two old men; they fought from being two young pups until they were two old dogs; from being two young horses till they were two old horses. And then they began to fight in the shape of birds, and it is in that shape they killed one another at the last.'"