Chance selection device

A hand-manipulatable three-dimensional device for generating and displaying groups of symbol combinations selected in pseudo-random sequence comprising an octahedral unit formed of a plurality of elements having equilateral congruent triangular faces, the elements interconnected together to permit rotation of one-half of the unit with respect to the other half along each of the three orthogonal planes of symmetry of the unit, the elements grouped about and enclosing a center sphere with their triangular faces facing outwardly, seven of the elements being movable on the outer surface of the sphere, the eighth element being secured to the sphere, the edges of which define the allowable directions of rotation of the other elements about the sphere and guide those elements during rotation, to the centre of the triangular face of each of the elements a tetrahedral segment being rotatably secured at the centre of its base, the base of each tetrahedral segment being of similar size and shape to the triangular faces of the elements of the unit, each of the tetrahedral segments having an outwardly directed apex and three outer faces, the three outer faces of each tetrahedral segment meeting at the apex at right angles, each of the faces of the tetrahedral segments bearing one of two distinguishing symbols to provide clear visual alignment or misalignment with the corresponding symbols on the corresponding face of an adjacent tetrahedral segment on an adjacent element, a stand having a base and upstanding arms spaced from each other on the base, the arms having, on their upper ends, means located so as to hold therebetween the apexes of oppositely positioned segments on the unit to permit rotation of the unit on the axis passing through said opposite apexes, whereby the alignment or misalignment of the symbols on corresponding pairs of faces of the segments when viewed along the facing outer vertex of each of progressive segments may be visualized.