Inception was the first Age written by Atrus, when he was somewhere between 14 and 17. The area around the link-in point was shaped like the Cleft, where both he and his father Gehn had grown up. A small patch of tiny blue flowers grew near a pool of water at the bottom of this alternate cleft, a tribute to the ones that grew over his mother's grave. Atrus had carefully crafted these elements, hoping that his father would notice, but he did not. Beyond the cleft stretched acres of rolling hills, forests, and mountains.
Gehn desecrated the Age shortly after he and Atrus visited it for the first time, scoring out whole sections of description from the book, in an effort to illustrate his superior knowledge of the Art, and to establish his dominance over his son.