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Reverse hourglass is based on the the hourglass principle of the design of a children's chairs, made a counter-current.It can be accompanied by the growth of the young, fun, different weight sit down inside the hourglass device change entered shrink, the water level will change. A chair made of translucent or transparent acrylic material, beautiful and fun.
Xizhen Shen, Yaer Fang, Yuejing Dong, Jiexiang Fan