About: http://webisa.webdatacommons.org/123014523

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	I suspect it has to do with handedness - if on is to the right, with a right-handed user, he is a pulling action, and off is a pushing action.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com