A visitor looks at the stacked bicycles of the installation “Stacked” by Chinese artist and activist Ai Weiwei, part of his exhibition “Ai Weiwei. Libero” (Ai Weiwei.Free) at Palazzo Strozzi in Florence, Italy, Sept. 21 2016. The exhibition opens on Sept. 23 through January 22, 2017. (Photo by Maurizio Degli Innocenti/ANSA via AP Photo)
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