Columbia subject headings:
Lighting, Architectural and decorative.
Mosaics, Medieval--Italy--Monreale.
Mosaics--Lighting.
Harvard subject headings:
Lighting, Architectural and decorative.
Mosaics, Medieval--Italy--Monreale.
Mosaics--Lighting.
Princeton subject headings:
Lighting, Architectural and decorative.
Mosaics, Medieval--Italy--Monreale.
Mosaics--Lighting.