| 摘要 |
A structural module which lends itself to the construction of playground edifices for climbing and crawling. The module is in the form of a tetrahedron whose four corners are truncated to define four triangular minor faces that are disposed in parallel relation to four major hexagonal faces, the module having a spherical central cavity. The radius of the sphere is greater than the distance between the geometrical center of the module and any major face thereof, circular ports in the major faces of the module being formed by the intersection of the spherical cavity and the major faces. A group of such modules may be interfitted in various ways, side by side as well as one above the other, to create an edifice in which one major face of each module abuts a major face of an adjacent module and in which the ports of the abutting faces are in registration, thereby interconnecting the cavities of the modules to produce a labyrinth.
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