About: http://webisa.webdatacommons.org/55956589

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	August 17, 2011 at 8:16 am Dan Zee I don???t think this an illusion, it???s more of a trick, especially if the shadow is painted onto the squares.
http://www.w3.org/ns/prov#wasQuotedFrom	discovermagazine.com