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There is fire imagery. Fire is used to both destroy society (burning books) and cleanse it so society can rise again.
Animal imagery like insects are used to represent the the degrading part of society. Mildred's stomach pump is called a "snake". Helicopters chasing Motag are described as insects.
There is light imagery. The old woman references light with a sense of hope, even if she is about to die, "Play the man, Master Ridley; we shall this day light such a candle, by God's grace, in England, as I trust shall never be put out."