    def __init__(self, screen, x):
        """
        :param screen: The Screen being used for the Scene.
        :param x: The column (y coordinate) for this trail to use.
        """
        self._screen = screen
        self._x = x
        self._y = 0
        self._life = 0
        self._rate = 0
        self._clear = True
        self._maybe_reseed(True)
:param screen: The Screen being used for the Scene.
:param x: The column (y coordinate) for this trail to use.
asciimatics/effects.py