1999 - 2014/11/12
If you take four solid hexagons and connect them at their edges, you get physical versions of the seven known tetrahexes.
You can also stack the hexagons connecting them at their hexagonal faces.
If both ways to join the four hexagons are allowed,
you get 23 different pieces and you can create 3-dimensional figures with certain symmetries and properties.
I made two set of the pieces one form nuts and another one from wood.
A stele with rotational symmetry is shown with the two sets.
The applet shows how the stele is built up step by step.