To obtain an assembly body having multiple axes of symmetry by placing each face member of cover piece on neighboring face member without gap, being around the central main body with it completely, being combined to the cover piece tightly and making it possible to take at least one piece off as the need arises.

A base face 10 is formed on the circumscribed spherical surface of dodecahedron as a spherical pentagon via five corner points. It is possible to replace for the spherical pentagon on the cover face 11 with a flat pentagon via five corner points in the same way or both of the cover face 11 and the base face 10 are formed as the flat pentagon and a cover piece 9 shapes head connecting pyramid and the face members 12-16 shape equilateral trapezoid. And it is formed of the complicate twelve cover pieces 9 and the dodecahedral cubic form which is combined with the center body like. And on at least one of the cover pieces 9, there is a net ring 25 which extends outgoing from the surface to take it off immediately from the completely assembled cube.