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Not knowing is unacceptable, and outright rejection would prove viewer's impotence, thus created an environment where artists are able to produce further and further extremes of blankness filled by those refusals to not-know, whose sensory deprivation creates phantasms, see the abyss looking back because we are doing the projecting.
See too: Kaspar Müller at Société, Kaspar Müller at Federico Vavassori