code: def mirror(self, axes='x'):
          
          polygon = np.array([[0,0], [0,1], [1,1]])
          space = Space(Place(polygon, polyhedra=self))
          return space.mirror(axes, inplace=False)[0].polyhedra[0]
docs: Generates a symmetry of the Polyhedron respect global axes.
          
          :param axes: 'x', 'y', 'z', 'xy', 'xz', 'yz'...
          :type axes: str
          :returns: ``pyny.Polyhedron``