I found this picture from a production of No Exit and I thought that it was a really good representation of the central interactions in the play. The specific composition of the poster, with the three characters in a triangle type shape and with everyone looking away from each other, communicates the basic inability to truly connect and compromise that the three characters share. Inez looks down on Garcin and Estelle jealously. Estelle avoids facing herself by closing her eyes (figuratively) and focusing on her lust (?) for Garcin. Garcin directs his gaze (the GAZE) away from both women.
Imagine for a second that you didn't know anything about this play. How effective is the poster at conveying the fundamental themes of the play?