Holden: You're in a desert, walking along in the sand when...
Leon: Is this the test now?
Holden: Yes. You're in a desert, walking along in the sand when all of a sudden you look down and see a...
Leon: What one?
*It was a timid interruption, hardly audible.*
Leon: What desert?
Holden: Doesn't make any difference what desert... its completely hypothetical.
Leon: But how come I'd be there?
Holden: Maybe you're fed up, maybe you want to be by yourself...who knows. So you look down and see a tortoise. It's crawling toward you...
"There were other thinkers, Bowman also found, who held even more exotic views. They did not believe that really advanced beings would possess organic bodies at all. Sooner or later, as their scientific knowledge progressed, they would get rid of the fragile, disease-and-accident-prone homes that Nature had given them, and which doomed them to inevitable death. They would replace their natural bodies as they wore out—or perhaps even before that—by constructions of metal and plastic, and would thus achieve immortality."