Tetrahedron

thingiverse

A tetrahedron forms when four equidistant points in space are joined by a network of line segments to form an unadulterated solid. Four triangular faces then define the exterior surface area of this remarkable polyhedron. A straight edge serves as each face, creating three mutually adjacent faces at each and every one of the tetrahedron's four unique corners. The interior volume occupied by this solid shapes its shape, demonstrating inherent beauty in an extraordinary geometric shape.