How does Bradbury's use of literary devices such as symbolism, allusions, satire, and irony enrich Fahrenheit 451?

All of these devices offer several levels of meaning in
the novel. Bradbury is known for his descriptive style, particularly his adept use of
figurative language. Consider just the opening paragraph of the novel, with figurative
language in bold:

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It was a special pleasure to see
things eaten, to see things blackened and changed. With the brass nozzle
in his fists, with this great python spitting its venomous kerosene upon
the world, the blood pounded in his head, and his hands were
the hands of some amazing conductor playing all the symphonies of blazing
and burning to bring down the tatters and charcoal ruins of history. With
his symbolic helmet numbered 451 on his stolid head, and his eyes all
orange flame with the thought of what came next, he flicked the igniter
and the house jumped up in a gorging fire that burned the evening sky red
and yellow and black. He strode in a swarm of fireflies.

That is a
power-packed paragraph! This wonderfully descriptive style is one reason this novel is
such a staple in classrooms across the nation. Another reason is Bradbury's use of
symbolism. The various symbols in the novel add depth and meaning to the plot.
Otherwise, this novel would be just a warning of a possible future. Yet in Bradbury's
hands, this becomes an allegory of humanity, the story of human society. Some symbols in
the book include fire, the salamander, and the Mechanical Hound. Fire is perhaps the
most potent symbol in the novel. It is a destructive force, eradicating books and the
freedom of thought that books represent. Yet later, when he is with the book people,
fire becomes a sign of connection, a renewal of human relationships. The salamander
connects to the fire, as the symbol of the firemen. In myth, the salamander is a lizard
that breathes fire, linking again to the opening paragraph of the novel
itself.

Finally, the Mechanical Hound represents the
disconnect between humans and technology. As society has become increasingly mechanized,
even the machines that human hands have built have turned against them. When the
Mechanical Hound pursuing Montag is destroyed, another one is sent in its place,
suggesting that technology used destructively cannot be easily
demolished.

Thus, Bradbury's techniques offer nuance and
shades of meaning to the novel. Without this style, the book would become a good science
fiction story, but not a classic of science fiction literature (or any
genre).