Periscopes Mechanical

The eight pieces of this puzzle are painstakingly handcrafted from a rich variety of woods.  (Each puzzle is unique, so coloring may vary.) 

The designer, Vaclav Obsivac, rates the difficulty of assembling the pieces into a cube at 5+ out of 5!  Other, slightly easier (but still very challenging!) shape challenges using a subset of the pieces are also included.