How does Reginald Rose use imagery in Twelve Angry Men?

The imagery is confined to the jury room for the play. It is a hot muggy room with little ventilation,

The room is furnished with a long conference table and a dozen chairs. The walls are bare, drab, and badly in need of a fresh coat of paint. Along one wall is a row of windows which look out on the skyline of the city’s financial district. High on another wall is an electric clock. A washroom opens off the jury room. In one corner of the room is a water fountain. On the table are pads, pencils, ashtrays. One of the windows is open. Papers blow across the table and on to the floor as the door opens. Lettered on the outside of the door are the words “Jury Room.”