| 摘要 |
A system having at least a first, a second and a third element, and a motion module. The elements are three-dimensional and each include a centre point therein. At least one face is coupled to the centre point. The at least one face has a motion-guiding module to define a trajectory over at least part of the face, and a motion-restriction module to limit the displacement of the centre point with respect to the centre point of one of the other elements. At least one trajectory includes the trajectory and a trajectory of the other element when interacting with the motion module. |
