The Nobel-winning author, whose newest book is out this week, discusses work by a few of her favorite writers. The Nobel Prize winner Olga Tokarczuk's fiction is known for its interest in the porosity of boundaries--between nations, between ethnicities, between fiction and reality, consciousness and dreams. As her novels and stories stage the constant flux of national borders, particularly in Eastern Europe (Tokarczuk is Polish), they also delight in supernatural and science-fictional elements. In " House of Day, House of Night," out from Riverhead this week, she writes, "All over the world, wherever people are sleeping, small, jumbled worlds are flaring up in their heads, growing over reality like scar tissue." Not long ago, Tokarczuk sent us some remarks about a few of her favorite sci-fi and speculative-fiction writers, whose books mix the fantastical and the prosaic masterfully.