Abstract: A three-dimensional structure defines space in the form of a tetrahedron as the simplest of the five Platonic solids with junction restraints at each of four vertices that allow lineation of size and angulation of shape and form by flexure and frictional slippage, respectively. This structure has use as an educational toy, puzzle, or game; in miniature as jewelry and pendants or support for variable requirements of easels or tables or display racks.