About: http://webisa.webdatacommons.org/441659911

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	A surface, such as a Mobius Strip or Klein bottle, that cannot be given such anorientation, is non-orientable.In U.S. Pat. No. 4,043,821, referenced above, a method is described to create an image that has a non-orientable surface.
http://www.w3.org/ns/prov#wasQuotedFrom	patentgenius.com