The appearance of Rachel’s window is important, because Philip will stand outside it again on the eve of his birthday, just before the most climactic point of the novel. It is also important that Philip is tongue-tied in this scene, because it suggests that Rachel has an advantage over him, since she always finds something to say, even in awkward situations. The idea that Rachel has the upper hand in her relationship to Philip is symbolically mirrored by the fact that she is elevated, sitting at her window, while Philip is below her on the ground.