    def __init__(self, screen, c=None, **kwargs):
        """
        :param screen: The Screen being used for the Scene.
        :param c: The starting value of 'c' for the Julia Set.

        Also see the common keyword arguments in :py:obj:`.Effect`.
        """
        super().__init__(screen, **kwargs)
        self._width = screen.width
        self._height = screen.height
        self._centre = [0.0, 0.0]
        self._size = [4.0, 4.0]
        self._min_x = self._min_y = -2.0
        self._max_x = self._max_y = 2.0
        self._c = c if c is not None else [-0.8, 0.156]
        self._scale = 0.995
:param screen: The Screen being used for the Scene.
:param c: The starting value of 'c' for the Julia Set.

Also see the common keyword arguments in :py:obj:`.Effect`.
asciimatics/effects.py