IX

They waited in the mouth of their new cave. The sun set. The stones cooled so that one could walk on them. It was almost time for the leaping out and the running toward the distant, glittering metal seed that lay on the far mountain.

Soon would come the rains. And Sim thought back over all the times he had watched the rains thicken into creeks, into rivers that cut new beds each night. One night there would be a river running north, the next a river running north-east, the third night a river running due west. The valley was continually cut and scarred by the torrents. Earthquakes and avalanches filled the old beds. New ones were the order of the day. It was this idea of the river and the directions of the river that he had turned over in his head for many hours. It might possibly—Well, he would wait and see.

He noticed how living in this new cliff had slowed his pulse, slowed everything. A mineral result, protection against the solar radiations. Life was still swift, but not as swift as before.

"Now, Sim!" cried Lyte, testing the valley air.

They ran. Between the hot death and the cold one. Together, away from the cliffs, out toward the distant, beckoning ship.

Never had they run this way in their lives. The sound of their feet running was a hard, insistent clatter over vast oblongs of rock, down into ravines, up the sides, and on again. They raked the air in and out their lungs. Behind them the cliffs faded away into things they could never turn back to now.

They did not eat as they ran. They had eaten to the bursting point in the cave, to save time. Now it was only running, a lifting of legs, a balancing of bent elbows, a convulsion of muscles, a slaking in of air that had been fiery and was now cooling.

"Are they watching us?"

Lyte's breathless voice snatched at his ears, above the pound of his heart.

Who? But he knew the answer. The cliff peoples, of course. How long had it been since a race like this one? A thousand days? Ten thousand? How long since someone had taken the chance and sprinted with an entire civilization's eyes upon their backs, into gullies, across cooling plain. Were there lovers pausing in their laughter back there, gazing at the two tiny dots that were a man and woman running toward destiny? Were children eating of new fruits and stopping in their play to see the two people 

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