THE PUZZLE SPLINE GALERY
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  as you can see the pieces are sliding of
  the secret compartment inside.Actually its exactly the shape of a penyhedron(rhombic dodecahedra) inside. 
  Even when all 6 pieces are slide of the puzzle stays together because it interlocks too. 
  Here is the remaining 3 identical pieces.The Pink wood is Pink Ivory. 
  Here is in Zebra wood.It too has nice contrast with the pink ivory. 
  In white background. 
  Sliding of. 
   
  on my hand.