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Reading is a good habit that people nowadays gradually abandon it.Here our bookshelf will in some degree let people realize the importance of reading and achieve pleasure in it.What you need to do is only to classify the books on the shelf out what you have read already on the left and the new-bought ones on the right.Unbalance of the shelf due to the gravity of books on each side will rotate the bookshelf and the pointer will tell you to read more or purchase more books.
Zhejiang University of Technology
Jia'nan Shi Mengcai Zhou Yushuang Chai Binbin Gong