Woolf goes beyond commenting on the treatment of mental illness. Using the characters of Clarissa and Rezia, she makes the argument that people can only interpret Septimus' shell shock according to their cultural norms. Throughout the course of the novel Clarissa does not meet Septimus. Clarissa's reality is vastly different from that of Septimus; his presence in London is unknown to Clarissa until his death becomes the subject of idle chatter at her party. By never having these characters meet, Woolf is suggesting that mental illness can be contained to the individuals who suffer from it without others, who remain unaffected, ever having to witness it. This allows Woolf to weave her criticism of the treatment of the mentally ill with her larger argument, which is the criticism of society's class structure. Her use of Septimus as the stereotypically traumatised veteran is her way of showing that there were still reminders of the First World War in London in 1923. These ripples affect Mrs. Dalloway and readers spanning generations. Shell shock, or post traumatic stress disorder, is an important addition to the early 20th century canon of post-war British literature.