Chinese activist and artist Ai Weiwei looks into a glass ball which is part of his installation at the National Gallery in Prague, Czech Republic, Thursday, March 16, 2017. Ai Weiwei has prepared for the gallery a 70-metre-long inflatable boat with life-size figures of 258 refugees, called "The Law of the Journey," and it is one of the artist's biggest work of art so far. (AP Photo/Petr David Josek)
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