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Isenheim altarpiece
https://www.khanacademy.org/humanities/renaissance-reformation/northern/england-france-tyrol/a/grnewald-isenheim-altarpiece
http://www.theguardian.com/artanddesign/2007/dec/12/art
http://study.com/academy/lesson/the-isenheim-altarpiece-iconography-function-context.html