Tensegrity Tetrahedron with "Me" Ball Suspended at Center of Volume of the Tensegrity Tetrahedron. Note that the six "solid" compression members are the acceleration vectors trying to escape from the system at either end by action and reaction, whereas the ends of each would-be escapee are restrained by four tensional wires, two long and two short, while the ball at the center is restrained from local displacement, torque and twist by three triangulated tension wires tangentially affixed from each of the four corners.