For Sheckley’s aliens, the key human trait is a knack (rare in the universe) for “Pushing.” What do the aliens mean by this? In contrast, what do you think the author suggests? He gives some hint in the final paragraphs of the story, when the human hero, searching for his soul, has a vision of his own “tortured” face—which propels the Ship forward at eight times the speed of light. How do you interpret this conclusion?