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this is a secret hidden jar, there is LED lights and master 's secret collectioninside. people can put things that they like but do not want others to see in it. when the jar standing, the water between two pieces of glass is muddy. if you shake the jar, sandwich water becomes clear, then you can see the collection and colourful LED lights. after a period of time, the water becomes muddy again.
Zhejiang Sci-tech University