If you’re an exceptional writer and you’re compelled to revisit your fictional world, to expand on it, polish it, or tinker with it, do something different, for crying out loud, something interesting and formally inventive. Marilynne Robinson is a good case in point. She revisits Gilead, Iowa and the Boughton family and in particular Jack Boughton from a different point of view, with a different narrator, and in a different genre altogether. The result is a glorious amplification of fictional realities. Agnar Mykle, I’m afraid to say, is a bad case in point. In the transition from Lasso Round the Moon to The Song of the Red Ruby, Mykle spurns the heavy lifting of artistic creation. He merely lengthens the original novel by adding a couple hundred pages to the narrative so that we can glimpse another year of Ash’s virility in action. He uses the same narrator and the same point of view, and writes in the same genre, and even uses the same framing device. If your writerly treatment is uninspired, why should my readerly attention be any different?