 Why does the Sand God keep the webfoots around?
The sand-thing was powerful, lonely and strange. He touched the pencil-line scar behind his ear where the cylinder was buried, marveling at the power stored there, power to fling him from earth to this fourth planet of the Centaurian system in an instant. A gray, funnel-shaped cloud of dust stood off to his left. Weather control made cyclones and other climatic phenomena on earth practically non-existent. The cloud did not move, though, except to spin on its axis rapidly, emitting a high-pitched, scarcely audible whine, like a high speed motor. Dark clouds capped one peak of the mountains on his left. He was here and Earth was somewhere up there. The sun burned fiercely, although he would have said it was about four o'clock in the afternoon, if this had been Earth. The sun shone obliquely, throwing Stinson's shadow upon the sand. The wind devil also had a shadow, although the sun shone through it and the shadow was faint. He was here to investigate, to determine if this planet was capable of supporting life. He examined the wind devil as closely as he dared, but it was composed only of grains of sand. But then, how could a group of loosely spaced grains of sand possibly have a nervous system? He became so absorbed in doing this that he failed to notice how the wind devil drew closer and closer, but when he inhaled the first grains of sand, the realization of what was happening dawned with a flash of fear. But up to now the tube and the chain was the only evidence of an advanced technology, unless the ancient inscriptions in the stone wall of the pool, and the statues lining the wall were evidences. There, at the cavern entrance, the wind devil writhed and undulated in a brilliant harmony of colors. These are the undesirables, the incorrigibles, the nonconformists from the sixth planet. There are these web-footed people, who were hostile until they thought I was a God. And this is contrary to the greatest law of all—that an entity, once in existence, can never cease to exist." "Please ask the Sand God," she said, "to speak to my people again. "As for the webfoots," the wind devil, or Sand God, said, "I will destroy them. They exist, therefore they always will. It has to do with what comes after physical existence, not with existence itself. To do so changes the most basic structure of nature." The Sand God did not reply.
 It amuses the Sand God to watch the webfoots evolution.
 It amuses the Sand God to watch the webfoots evolution.  It amuses the Sand God to play with the webfoots.  The webfoots worship him like a God even though he is not one.  The webfoots fear of the Sand God amuses him.