How does Daniel J. Boorstin use imagery in The Creators?

Imagery:

"The discovery of his power to paint vivid images, attested on the walls of his Neolithic cave dwellings, was a historic leap in man's self-awareness... He had the power to awe himself by his own creations and his newly discovered powers as creator. The works of the artists of Altamira remain alive though we do not know and may never know their purposes. They remind us of the iridescence of art and the transcendence of the work of art over its maker."

"When we read Rabelais in translation, we are grasping for his wit through a veil. Rabelais's book was an act of faith in a language he was beginning to make literary."