About: http://webisa.webdatacommons.org/55845627

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	Multi-direction curves: Terrain objects, saddles, and curtains are all prime examples of surfaces that curve in more than one direction at a time.
http://www.w3.org/ns/prov#wasQuotedFrom	dummies.com