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Shibboleth
http://www.theguardian.com/artanddesign/2007/oct/08/art3
http://www.nytimes.com/2007/12/11/arts/design/11crac.html?_r=0
https://en.wikipedia.org/wiki/Shibboleth_(artwork)
https://www.khanacademy.org/humanities/global-culture/global-art-architecture/a/doris-salcedo-shibboleth
http://www.tate.org.uk/whats-on/tate-modern/exhibition/unilever-series-doris-salcedo-shibboleth