Within the chimney come steps unapparent from within the room. Ascend to a door which opens unto a rooftop studio invisible from the outside of the building nestling as it does among the roofs. Only birds being able to fly in those days could detect its presence. On glass plates monks create illuminations. This methodical but creative work keeps them quietly for apparently short yet in fact long periods of time. At some point in the day each monk will find himself drawn to step through the fireplace and devote some time to this work. Needless to say when the fire is lit it is impassable.