The Green Box is a long narrow room with no windows and green shag carpet. There is a shallow ledge around the perimeter of the room, one foot wide by six inches high. The rectangle in front of the door is a movable wall that is 4 feet wide by 8 1/2 feet high and 2 feet deep. The ceiling in the space between the movable wall and the door is about 9 feet high. Beyond the movable wall, the ceiling is about 10 feet tall. There are electrical outlets around the perimeter of the room and track lights on the ceiling.