An Age
Brian Aldiss
 The story concerns Edward Bush, an artist searching for inspiration in the past. When Bush returns from a long stay in the Cryptozoic, he finds that his nation (presumably the United Kingdom) has been taken over by a totalitarian government. He is immediately drafted into the military and given the mission to kill the scientist Silverstone. As Bush mind travels again to fulfill his mission, he learns of Silverstone's new philosophical and scientific discoveries. Bush and Silverstone meet and decide together to usher in a new era of humanity, one enlightened by the realization that time flows backward.