Inspired by Japanese puzzle games, the "Join" table by Ding 3000 links three legs in what's called the "Devil's Knot".
Kongming lock is a traditional Chinese intellectual toy. It is said that the toy was invented by Zhuge Kongming some 2,000 years ago based on the principles of the eight-diagram metaphysics. It was widely popular among the folks. The concave and convex parts inside the three-dimensional interpolation toy mesh perfectly. Kongming locks come in different shapes and sizes, with different internal structures. But they are usually easy to take apart and difficult to reassemble.
Woodworking for Mere Mortals: Free videos and plans. : Make a wood puzzle
Wooden Burr Puzzles
Wooden Burr Puzzles Notch a few sticks and drive your friends crazy. By Jock Holmen Something’s got to give when pieces of wood intersect at 90° angles. That’s the reality behind the curious assemblies shown here. Known as burr puzzles, because they resemble seed burrs, these brain-teasers consist of three or more notched pieces that go together at right angles. Give one of these tricksters to an unsuspecting friend …
And that's how the Japanese do it. Wood working!:
Referencia: La última guía de madera Conjunto de Visual Referencia - Core77