Which figure of speech is used in this text?
What thoughts I have of you tonight Walt Whitman, for I walked down the sidestreets under the trees with a headache self-conscious looking at the full moon.
—Allen Ginsberg, "A Supermarket in California"
A: antithesis
B: apostrophe
The text uses apostrophe, a direct address to an absent person or a nonhuman entity.
What thoughts I have of you tonight Walt Whitman is a direct address to Walt Whitman, an absent person. (Walt Whitman was an American poet who died in 1892, over half a century before this poem was written.)