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In page Ai Weiwei:

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One of the major protests by U.S. museums took place on 19 and 20 May when the Museum of Contemporary Art San Diego organized a 24-hour silent protest in which volunteer participants, including community members, media, and museum staff, occupied two traditionally styled Chinese chairs for one-hour periods.[13] The 24-hour sit-in referenced Ai's sculpture series Marble Chair, two of which were on view and were subsequently acquired for the museum's permanent collection.[citation needed]