5 Sienna leaned into the sense of weightlessness as she flew above a world that shifted along an ever-changing boundary. The lines of the walled map morphed into three-dimensional streets next to an ocean that stretched into the distance. The world curved into the horizon and for a moment, she couldn’t tell whether she was in the map or above it. Could she keep traveling up here, far beyond the border? She swallowed the exhilaration and dived down into the city, giddy with sensation. The smell of rotting fish and the salty tang of the ocean greeted Sienna as she opened her eyes. They were in a street behind a food market, the shouts of stallholders blending with the call of seabirds above them as they dived down to snatch pieces of discarded produce. Sienna could just make out the ocean