Poser Dvoráková bar comprises an assembly a divided cage (2) movable assembly small divided cage (3) in the shape of a cube with curved surfaces, a movable small block (4) in the shape of a cube with curved surfaces, a movable large square (5) in the shape of cube curved surfaces, cube (6) in the shape of a cube with curved surfaces and three blind holes, floating eight-pointed star and spatial (24) and a movable assembly (8) five cone (30) with curved surfaces and balls (31). Large divided cage (2) is composed of two parts (9) and has the shape of a cube (10) whose vertices and edges are provided with a curved surface (11), each wall (36) of the cube (10) comprise at the through hole ( 12) defining inside this cube (10) space (28) bounded spherical surface (13).
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