Explanation: An Hyperbole is a literary device which consists in make an obvious exaggeration to help to emphasize a point in a text. In the poem "For a Lady I Know" by Countee Cullen, we can see a clear example of an hyperbole, because the author intentionally exaggerates the Lady's racism by saying that she thinks that even in heaven there is a separation of classes, where the black cherubs are the ones to do the chores.