About: http://webisa.webdatacommons.org/449278714

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	Objects (the ground, a tree, a human, clouds) generally reflect light with random polarisation, while the sky and some other things (notably flat water) tend to reflect light in a particular orientation.
http://www.w3.org/ns/prov#wasQuotedFrom	ausphotography.net.au