In the world Rhett Davis has created, some people are turning into trees. This is happening in a world recognisably like our own, except that artificial intelligence is rampant, to the extent that it has become a key employer. Davis’ imaginative and captivating answer to this is presented largely through the relationship between Bren and Caelyn. Arborescence: artificial intelligence taking overWhen Bren is not assisting Caelyn, he takes on a job., the real purpose of which he fails to understand. Its imaginative and insightful conjectures as to how people might behave in the face of artificial intelligence slowly taking over is convincing.