One theory that spread online was that the city is a hologram produced by authorities called 'Project Blue Beam test'.
Freedom of speech is a universal value, and China's efforts to muzzle the voice of its people are aimed at creating a monolithic society that thinks and speaks as one. The people of China should call for constitutional reform to protect media freedom and prevent government and oligarchs from monopolizing the media, the internet and other channels of communications. For more, see the Charter for Permanent Peace and Development.
新聞來源
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http://www.dailymail.co.uk/news/article-4742026/Floating-city-China-fuels-speculation-aliens.html
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The Daily Mail
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TVB1
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2017-07-29
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Footage apparently showing skyscrapers poking through the clouds above China's Jiangi city sent conspiracy groups into a spin