About: http://webisa.webdatacommons.org/277278766

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	In most cases, we are safe with the distance squared idea, because most of our subjects are pretty large compared to our light sources.
http://www.w3.org/ns/prov#wasQuotedFrom	ppa.com