Tomas and Tereza are “at the last station” because they are going to die the very next day, as the reader knows from previous sections of the book. Kundera’s use of the word “station” again recalls the novel
Anna Karenina, whose title character dies at the end of the book at a train station. The room resembles Tereza’s childhood bedroom, which again represents repetition and a form of eternal return. Even though they will both die the next day, the butterfly connotes hope and optimism. Tereza and Tomas are in love, and they are as happy as they can possibly be, and this implies that their lives are not meaningless despite the “unbearable lightness of being.”