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the doorbell is installed in the doorknob which is hollow. the air inside will be made to flow by the gripping strength when our hands holding the doorknob and distorting the silica gel , making the bell ring. the theory here is similar to that in the toy trumpet.
JiangnangUniversitySchool of Design
Industrial DepartmentTutor Shen Jie
WuXi, China
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JiangnangUniversitySchool of Design
Industrial DepartmentTutor Shen Jie
WuXi, China
Yuqiang Zhou ,Kai Xia
