Final answer:
Ray Bradbury uses simile and metaphor as literary techniques in 'Fahrenheit 451' when describing eyes to create vivid imagery and convey deeper thematic elements of the narrative.
Step-by-step explanation:
The literary technique used by Bradbury in Fahrenheit 451 when describing eyes as 'Two moonstones looked up at him in the light of his small hand-held fire; two pale moonstones buried in a creek of clear water over which the life of the world ran, not touching them,' is simile and metaphor. A simile is a figure of speech that compares two different things in an interesting way, often using the words 'like' or 'as', which we see in the comparison of eyes to moonstones. Metaphor is a direct comparison between two unrelated things, as shown by the eyes being described as moonstones in a creek, suggesting a detachment or isolation from the surrounding world. Through these descriptive comparisons, Bradbury vividly paints a picture that adds depth to the characters' experiences and emotions. This use of figurative language is integral in creating imagery that not only paints a picture for the reader but also conveys thematic elements throughout the narrative.