144
Fountain (second version)
http://www.tate.org.uk/art/artworks/duchamp-fountain-t07573
https://www.sfmoma.org/artwork/98.291
http://www.telegraph.co.uk/culture/art/3671180/Duchamps-Fountain-The-practical-joke-that-launched-an-artistic-revolution.html
http://www.metmuseum.org/toah/hd/duch/hd_duch.htm
http://www.economist.com/node/15766467
http://www.theguardian.com/books/2008/feb/09/art
