| 摘要 |
PROBLEM TO BE SOLVED: To obtain a regular polyhedron of a hollow structure which is light in weight and highly convenient for storage, transfer and carriage and enables pursuit of properties of structural rules thereof through a process of assembly or disassembly and which enables addition of values as an artistic handicraft article by working on the surface itself of a polyhedral pyramid board variously. SOLUTION: The mutual joining surfaces of regular pyramid boards need to be supported temporarily by a circumscribed sphere, since no adhesive is used therefor and since a frictional force does not work sufficiently in the course of assembly. The circumscribed sphere has a structure separated into lower and upper hemispheres, and after temporal assembly, the polyhedron is tightened and fixed for assembly until each vertex thereof comes into contact with the circumscribed sphere.
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