Bombs
As the Blitz intensifies, imagery surrounding bombs and their associated destruction become more prevalent. And as the Blitz intensifies, more bombs drop, causing more death and destruction. Fitzgerald uses this imagery to underscore just how vicious, cruel, and unrelenting the Nazis were and how little they cared about the lives of innocent civilians.
Microphone
As Sam grows more accustomed to his new life working at the British Broadcasting Corporation (BBC) during World War II, microphone imagery (and other imagery surrounding the radio business) becomes more and more common. This imagery illuminates how obsessed Sam is with his job and shows readers how talented Sam is at his job.
Explosions
Throughout the novel, there is seemingly constant imagery surrounding the sound of explosions. These sounds underscore the constant threat the people of the United Kingdom are living under. Much of their lives, as a result of the Blitz, are spent avoiding the Nazi German bombs. This induces paranoia and makes the citizens paranoid about the bombs.
Fire
As the bombs explode, wreaking havoc on the British people and their buildings, fire imagery becomes more common. Naturally, when bombs explode on buildings, fires ensue. And those fires destroyed the very soul and lifeblood of England: the architecture, the history, and the culture. In a bombing campaign to destroy the will of the British people to fight, destroying their architecture, history, and culture would be a good place to start.
