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A roly tumbler or a self-righting doll is a toy that tights itself when it is pushed over. We apply the theory of the self-righting doll to this pen to reinforce the stability of the pen on the table and make it not so easy to scroll and fall to the ground.
It will keep stable automatically in a plane surface.
It will also keep stable automatically in an inclined surface.
Polytechnic University of Turin
Shen yue liu yuanyuan