1..4 Solid Equilateral Triangles

Take up to four solid equilateral triangles and join these parts at their triangular or rectangular faces.Then you get stacked polyiamonds of order 1..4 with a total number of 66 triangles.
These pieces can be used to construct prisms with a cross section area of 11 triangles and a height of 6. Furthermore you can build symmetric steles and combinations of three kind of basalt steles with different heights. A box to store the pieces is also provided.