About: http://webisa.webdatacommons.org/435418925

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	If you want to simulate something like a very deep tube or something like that there is a shader you can use to make a surface appear entirely black (also there wont be projectile impacts on the surface).
http://www.w3.org/ns/prov#wasQuotedFrom	quakelive.com