Marina Abramovic’s new performance 512 Hours opened yesterday at the Serpentine, with the artist granted free reign to enocunter visitors in the empty gallery space and do as she wishes.  “The idea is that the public are my material, and I am theirs,” she says. “I will open the gallery myself in the morning and close it at 6 p.m. with my key. I want to understand how I can be in the present moment, be with the public.â€
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