Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Lichtlehre-de#Sense
Optics-en#Sense
Lichtleer-nl#Sense
Lyslære-da#Sense
Science de la lumière-fr#Sense
Ottica-it#Sense
Valo-oppi-fi#Sense