docs: def randomize_args(self):
          '''Get new parameters for spirograph generation near agent's current
          location (*spiro_args*).
          '''
          args = self.spiro_args + np.random.normal(0, self.move_radius,
                                                    self.spiro_args.shape)
          np.clip(args, -199, 199, args)
          while args[0] == 0 or args[1] == 0:
              args = self.spiro_args + np.random.normal(0, self.move_radius,
                                                        self.spiro_args.shape)
              np.clip(args, -199, 199, args)
          return args