In the story "A Letter to God," the raindrops are compared to new coins by Lencho. He exclaims, "These aren't raindrops falling from the sky, they are new coins. The big drops are ten cent pieces and the little ones are fives."
This is a metaphor — a quality of one thing is transferred to another. Lencho compares the rain to coins because, as a farmer, rain meant prosperity and a good harvest. Just as coins bring wealth, the rain would ensure a good crop, making it as valuable as money to him.
Source: A Letter to God, Chapter 1
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