 What is so significant about this new area that Rolf is in?
As the spinner dropped him slowly down into the vast emptiness of the great shining gulf, Rolf could see that a broad band of stone divided the green fertile plains and forests from the desolate desert wastes of the other half. Toward this barrier the spinner bore him, and Rolf was content to let it move in that direction—from the heights of the wall he could scout out the country beyond. The spinner had slowed its speed; it seemed to Rolf that he must be falling free in space for a time, but the feeble gravity of the tiny world tugged at him more strongly as he neared the wall. Deftly Rolf nested the spinners again in their pack before he set out toward the heaped-up mass of stone blocks that was the wall.
 It is abundant with water. It would be enough for all of Mars and the colonies.
 It is abundant with water. It would be enough for all of Mars and the colonies.  The presence of Altha, and her living here in secrecy.  It is a secluded area, not yet touched by most other people.  The miniature planet and the way it functions.