About: http://webisa.webdatacommons.org/202917742

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	@Tony rays are a geometrical concept imaging the direction of energy propagation but have no attributes other than that, geometry.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com