The Jack Puzzle is comprised of six different notched brass bars that interlock in one specific way to create a unified "jack" shape.
It is exactingly milled by skilled machinists and is surprisingly heavy. A desk object, a paperweight, and a true distraction—but be forewarned, if you take it apart, you might not be able to figure out how to put it back together…
Assembly instructions (hand-drawn by Nate) are included.