Done by Marina Abramovic at 1974
https://www.youtube.com/watch?v=hrzdYFLqMOU
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Marina Abramović’s Rhythm Zero (1974) demonstrated de-individuation through 72 objects ranging from comforting (rose, perfume) to dangerous (knife, gun) during 6 hours where audience escalated from placing roses in first 2 hours to cutting her shirt, neck, and pressing thorns into her stomach by hour 3.
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The performance paralleled Stanford prison experiment and Milgram’s obedience study, showing how informational social influence normalizes violence as groups lose self-awareness, accountability, and empathy, merging into a collective capable of cruelty.