What literary term is illustrated by Edgar Allan Poe's use of different colors for the rooms especially the black room in The Masque of the Red Death?

Poe crafts the last, black room as the ominous endpoint, the room the guests fear just as they fear death. The clock that presides over that room also reminds the guests of death's final judgment. The hourly ringing of the bells is a reminder of the passing of time, inexorable and ultimately personal.