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<http://rdf.freebase.com/ns/quotationsbook.quote.19639> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://rdf.freebase.com/ns/common.topic>.
<http://rdf.freebase.com/ns/quotationsbook.quote.19639> <http://creativecommons.org/ns#attributionName> "Source: Freebase - The World's database".
<http://rdf.freebase.com/ns/quotationsbook.quote.19639> <http://rdf.freebase.com/ns/media_common.quotation.author> <http://rdf.freebase.com/ns/en.leonardo_da_vinci>.
<http://rdf.freebase.com/ns/quotationsbook.quote.19639> <http://www.w3.org/1999/xhtml/vocab#license> <http://creativecommons.org/licenses/by/3.0/>.
<http://rdf.freebase.com/ns/quotationsbook.quote.19639> <http://rdf.freebase.com/ns/type.object.name> "-- Three classes of people: Those who see. Those who see when they are shown. Those who do not see."@en.
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