How does W. Somerset Maugham use imagery in For Services Rendered?

The imagery is set in one spot. The entire play takes place in the home of Leonard and Charlotte Ardsley, situated in a small country town outside of Canterbury, England. One afternoon, Mrs. Ardsley takes tea with her son Sydney, who has become blind as a result of war injuries. She tells him that her daughter Ethel has arrived and that her husband, Howard, will pick her up later. The two discuss Howard's drinking problem and his relationship with Ethel.