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Highsmith uses a simile when she refers to Mr Knoppert as being as ‘happy as the father of a new child’. This simile acts as comparison which effectively enables the reader to picture the sheer scale of his fixation. It suggests that his feelings have  progressed beyond fascination and obsession and now border on love and the overwhelming bond felt when becoming a new father, creating new life.

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Highsmith is effective in conveying his growing obsession as she states that he ‘had to go and look at the eggs every hour’. This is not really the action of someone who is just interested and suggests that he is becoming more obsessed. The word ‘had’ adds to this by showing that he no longer feels any control over it. It is taking him over.