Cassatt created a series of theater scenes in the late 1870s, displaying an interest in city nightlife shared by many of the Impressionists. This work, showing a woman (often said to be her sister Lydia) seated in front of a mirror with the balconies of the Paris Opéra House reflected behind her, demonstrates the influence of Cassatt’s friend Edgar Degas, particularly in the attention paid to the effects of artificial lighting on flesh tones. This painting was shown in Paris at the fourth Impressionist exhibition in 1879, where it was singled out for much praise.