About: http://webisa.webdatacommons.org/149577025

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	@RahulNarain since one of the surfaces is a plane, the result is two dimensional on that plane.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com