" Opening by saying "Flood-tide below me!
Those performing the titular action are described as "Crowds of men and women attired in the usual costumes!" The author concludes by observing that "You furnish your parts toward eternity;/Great or small, you furnish your parts toward the soul." Opening by saying "Flood-tide below me! I watch you face to face," it describes "the walk in the street, and the passage over the river." For 10 points—name this Walt Whitman poem set in New York.
Those performing the titular action are described as "Crowds of men and women attired in the usual costumes!"
“{Crossing Brooklyn Ferry}”