What is a metaphor in the story flowers for algernon?

In "Flowers for Algernon," a key metaphor is the journey of Charlie Gordon's intelligence compared to the rise and fall of a flower. Initially, Charlie is like a flower in bloom, experiencing growth and enlightenment as he undergoes the experimental surgery. However, as his mental state deteriorates, he becomes a wilted flower, symbolizing the fragility of intellect and the transient nature of life’s joys. This metaphor underscores the theme of human potential and the bittersweet nature of knowledge.