The (Almost) Impossible Cube

This beautifully handcrafted puzzle consists of two deceptively simple looking pieces (see image above). 
It is made from quality native New Zealand timber (Rimu), which exhibits a beautiful grain.

The (Almost) Impossible Cube

When delivered, the two wooden pieces shown above are assembled in a Z-shape. 
Take them apart, turn them a few times in your hand to forget their original positioning, 
then try to reassemble the Z shape. 
For most people, this already is a surprisingly difficult task.

But here is the real challenge:
From the two wooden pieces you have to assemble a cube - that sounds easy. 
But you will find that the two parts don't like to be joined to a cube - something is wrong here. 
How in the world should that work? 
Well, get the puzzle and find out for yourself...

Material: Quality native New Zealand wood.  The wood has been treated with natural wood oil to enhance the nice grain. 
Size: Cube 7 x 7 x 7 cm (2 13/16 inch) 
Price : 
NZ$ 39.- (add $10 for postage nationwide)
US$ 30.- (US$ price includes postage and packaging worldwide)
Wholesale (min 10) : US$ 20.- (Add US$ 10.- for postage for your order of any size)