What is the author's style in No Exit by Jean-Paul Sartre?

The few objects in the room have symbolic meaning, especially in defining the characters. The sofas are of different colors—wine-colored, blue, and green—and Estelle insists on taking the blue one because it best matches her dress. This symbolizes her superficiality. Estelle also uses the paper knife to stab Inez. This is ineffective and leads to Estelle's acceptance that she is truly dead and in hell. The bronze statue serves a similar purpose for Garcin. The statue represents how escape is futile because it is too heavy to move. Garcin is also concerned about the bell, and if it works, more than the other characters. The bell symbolizes a link with the outside world, but it does not always ring.