PURPOSE:To easily produce shapes and figures with accurate vector balance, various polyhedra and cubics by a method wherein creases are press-formed or fold guide lines are printed along the sides of a small equilateral triangle formed by connecting the three middle points on the side of a piece of equilateral triangle paper, and slits are made along the perpendicular lines drawn from the apexes of the equilateral triangle to the sides of the small equilateral triangle. CONSTITUTION:Creases are press-formed along the sides 1, 2 and 3 of a small equilateral triangle which is formed by connecting the three middle pints P, Q and R on the sides of a piece of equilateral triangle paper, and slits are made along perpendicular lines drawn from the apexes A, B and C of the equilateral triangle to the sides 1, 2 and 3 of the small equilateral triangle. To form a part of combination, right triangles (a), (c) and (e) among the right triangles (a)-(f) are folded along the creases in the same direction and each apex is inserted under another folded right triangle. The part has three pockets 8, 9 and 10 and three claws (b), (d) and (f). In case a regular tetrahedron is made, the claws of three parts are inserted into the pockets of another one part to form an irregular plane shape, and the irregular plane shape is turned inside out to form a cube having equilateral triangle facets, and the claws are inserted into pockets on the opposite sides to accomplish a tetrahedron.
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