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There is nothing more common than toilet paper. Person for person, we consume 20 trees per year. So I redesign the toilet paper. Instead of a straight line, every piece of paper is connected by a line with many sawteeth, so people will not tear the paper out as their wishes. Moreover, the sawteeth-form line symbols the forest depleting day by day, which remind us at every moment we should protect forest in our daily life.
Chen Chen Ouyang Chenlin Gui LIN Wang Lei Yang Xiao Fu Yueming Rao Yu Li Yan Fang Yao Chen Si Zhan Yangyang