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Compare Knight to Bacher, two for whom the sign's circumcision opens it as an affectual and metaphorical possibility, snip its end so that it can't complete the power it was meant to effect. Space photocopied to empty its intent, remove us from it. Its signified sort of just floating away.
See too: John Knight at Greene Naftali, John Knight at Cabinet, Lutz Bacher at Statens Museum for Kunst