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The Arabic numeral '1,2,5' can combination into any number through the addition and subtraction.This principle has being used into the face value of money.So,why don't we use it to design a chair.Then we can stack the different height of chairs into different height.Meanwhile, in a family we need different height of chairs,and as the child grow up we also need different height of chairs.The most important is that the chairs is also a kind of toys which could help child develop mentally.
Nanjing University of Aeronautics
Xiamen Tianma Microelectroincs
Xiamen City, China
KEHUA Group (China)