For a mile or more across the flat surface of the rock that was Gus Hamilton's moss garden, ran a string of such game-boards, each one different, each one having served as the scene of a now-completed game. Oliver Meek cautiously wedged his stilts into two pitted pockets of rock, eased himself slowly and warily against the face of a knob of stone that jutted from the surface. Even in his youth, Meek remembered, he never had been any great shakes on stilts. Here, on this bucking, weaving rock, with slick surfaces and practically no gravity, a man had to be an expert to handle them. Meek knew now he was no expert. A half-dozen dents in his space armor was ample proof of that. Comfortably braced against the upjutting of stone, Meek dug into the pouch of his space gear, brought out a notebook and stylus. Flipping the pages, he stared, frowning, at the diagrams that covered them. None of the diagrams made sense. They showed the patterns of three other boards and the moves that had been made by the bugs in playing out the game. Apparently, in each case, the game had been finished. Which, Meek knew, should have meant that some solution had been reached, some point won, some advantage gained. But so far as Meek could see from study of the diagrams there was not even a purpose or a problem, let alone a solution or a point. The whole thing was squirrely. But, Meek told himself, it fitted in. The whole Saturnian system was wacky. The rings, for example. Debris of a moon smashed up by Saturn's pull? Sweepings of space? No one knew. Saturn itself, for that matter. A planet that kept Man at bay with deadly radiations. But radiations that, while they kept Man at a distance, at the same time served Man. For here, on the Inner Ring, where they had become so diluted that ordinary space armor filtered them out, they made possible the medical magic of the famous radiation moss. One of the few forms of plant life found in the cold of space, the moss was nurtured by those mysterious radiations. Planted elsewhere, on kindlier worlds, it wilted and refused to grow. The radiations had been analyzed, Meek knew, and reproduced under laboratory conditions, but there still was something missing, some vital, elusive factor that could not be analyzed. Under the artificial radiation, the moss still wilted and died. And because Earth needed the moss to cure a dozen maladies and because it would grow nowhere else but here on the Inner Ring, men squatted on the crazy swirl of spacial boulders that made up the ring. Men like Hamilton, living on rocks that bucked and heaved along their orbits like chips riding the crest of a raging flood. Men who endured loneliness, dared death when crunching orbits intersected or, when rickety spacecraft flared, who went mad with nothing to do, with the mockery of space before them. Meek shrugged his shoulders, almost upsetting himself. * * * * *