Answer:
Walt Whitman uses commas to separate objects in listicles and create a pause.
Explanation:
"When I Heard the Learn'd Astronomer" is a short poem written by Walt Whitman. The speaker writes about the lecture he attends of a learn'd astronomer.
The poet uses commas to separate objects in listicles. It also helps in creating the pause and making lines readable. The commas also make lines shorter.