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The cartoon is a wry commentary on some modernist performances. Why have so many modernists and postmodernists been pre-occupied with urine and feces? If art is about expressing oneself, what kind of self are such artists expressing? Or if art is a window into the artist’s soul, what kind of souls are being exposed here?
Marcel Duchamp:

Demuth:
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Warhol:
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Mapplethorpe:

Serrano:

Manzoni:
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My explanation: “From Modern to Postmodern: Why Art Became Ugly” (video lecture and later text publication).