How does Ayn Rand use imagery in For the New Intellectual; the Philosophy of Ayn Rand?

Imagery:

"All stones are cobblestones to you. And diamonds—they're useless, because they sparkle too brightly in the sun, and it's too hard on the eyes, and it's too hard under the hoofs marching into the proletarian future. You don't pave roads with diamonds."

"If you saw Atlas, the giant who holds the world on his shoulders, if you saw that he stood, blood running down his chest, his knees buckling, his arms trembling but still trying to hold the world aloft with the last of his strength, and the greater his effort the heavier the world bore down upon his shoulders—what would you tell him to do? 'I ... don't know. What ... could he do? What would you tell him?' To shrug."