Get new parameters for spirograph generation near agent's current
        location (*spiro_args*).

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