THE HARD NUT a set of box puzzles

• This puzzle set consists of several polyhedrons in graduated sizes one fitting inside each other.
  
• Each polyhedron is made up of several identical, interlocking parts.
• The puzzle demonstrates the symmetry features of different polyhedrons and their spatial interaction.
• The most interesting part about this set of puzzles is that they can fit inside one another.
• Polyhedrons presented are: cubic octahedron, in it rhombic cube, in it rhombic dodecahedron, in it cube, in it star-like octahedron, in it icosahedron (presented as a sphere).

• There exist other sets of input polyhedrons.The puzzle helps to develop spatial imagination, volume vision, allows the player to learn basic laws of symmetry, brightly illustrates the interrelation of polyhedrons.