Here is a 3D model of a Tetrahedron. The edges are plastic sticks stringed together with red, blue and green string. Each corner of a the Tetrahedron has #Torque. The torque depends on the #Tension. As each string makes a 109 degree #rotation, they lose space in the corners, making less and less space per loop, until each string finally forms the shape of a circle in the center. The shape of each #vertex is warped due to torque and tension.
