code: def dither_symbol(value, dither):
      
      dither = DITHER_TYPES[dither][1]
      return dither[int(round(value * (len(dither) - 1)))]
docs: Returns the appropriate block drawing symbol for the given intensity.
      :param value: intensity of the color, in the range [0.0, 1.0]
      :return: dithered symbol representing that intensity