O, sweep of stars over Harlem Streets

O, little breath of oblivion that is night

1) what literary device is used in line 2?
Metaphor or onomatopoeia?

2) "little breath of oblivion" refers to what quality of night?
Bleakness or silence?

To determine the literary device used in line 2, we need to analyze the words used in the line. In this case, "little breath of oblivion" suggests a metaphor.

Now let's consider the phrase "little breath of oblivion" and determine what quality of night it refers to. In the context of the given lines, "oblivion" implies forgetfulness or being unaware. Since the phrase "little breath" implies something light or faint, it suggests that the quality being conveyed here is "silence" rather than "bleakness." This is because a "breath" is associated with subtle and quiet movements.