About: http://webisa.webdatacommons.org/408872492

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 do not deny that the rock certainly appears to have a C on it [see photo], however to suggest this is some sort of studio prop marking seems a bit far-fetched.
http://www.w3.org/ns/prov#wasQuotedFrom	liveleak.com