def plot_discrete(self, show=False):
        """
        Plot closed curves

        Parameters
        ------------
        show : bool
           If False will not execute matplotlib.pyplot.show
        """
        import matplotlib.pyplot as plt
        from mpl_toolkits.mplot3d import Axes3D  # NOQA
        fig = plt.figure()
        axis = fig.add_subplot(111, projection='3d')
        for discrete in self.discrete:
            axis.plot(*discrete.T)
        if show:
            plt.show()