Abstract: A construction kit is indicated which consists of elongated stave elements (2), which at their ends are provided with protruding plate portions (6, 10) with pins (8) and holes (12) for mutually rotatable end joining of the state elements in one and the same plane. The elements are primarily intended for being laid out as edge or outline markings, but they are provided with groove-shaped depressions (4), which by means of bonding blocks (32) also allow a stabilized stacking of the elements for forming spatial structures.