About: http://webisa.webdatacommons.org/173344340

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	The explanation is very simple, but nobody seems to phrase it the same as me.The idea is this: a lens, he is in focus, is a device that converts direction into position.
http://www.w3.org/ns/prov#wasQuotedFrom	sigfpe.com