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People view exhibits at the "Pop Art Stars" exhibition in Lisbon, Portugal, Sept. 11, 2019. The exhibition displays 122 art pieces, and runs until Jan. 5, 2020. (Photo by Pedro Fiuza/Xinhua)

People view exhibits at the "Pop Art Stars" exhibition in Lisbon, Portugal, Sept. 11, 2019. The exhibition displays 122 art pieces, and runs until Jan. 5, 2020. (Photo by Pedro Fiuza/Xinhua)