Answer:
The author uses the personification in the lines “the trees no longer silver / but black fingers scratching a gray sky."
Explanation:
Perspnification is the figure of speech that gives human characteristics to animals or inanimate objects. We can see this in the poem quoted in the question above, where in lines 17-19, the poet uses personification.
In these lines, the poet states that “the trees no longer silver / but black fingers scratching a gray sky.” This shows how the poet allowed trees to have fingers, which is a human characteristic. Along these lines, the poet wants to show how a painter's perception of certain elements can change over time and the experiences he lives.
