Octahedron Box

The four pieces of this puzzle are painstakingly handcrafted from maple, walnut, and acacia.  (Each puzzle is unique, so coloring may vary.) Your aim is to remove the wooden marble from the puzzle.  You could also hide a small gift inside this puzzle in place of the marble.  Designer Vaclav Obsivac rates the difficulty of taking this puzzle apart and reassembling it as 4 out of 5.