'Precede object by a slash of the proper size.'

def leftslash(self):

    height = ((max(self.baseline, ((self.height() - 1) - self.baseline)) * 2) + 1)
    slash = '\n'.join((((('    ' * ((height - i) - 1)) + xobj('/', 1)) + ('    ' * i)) for i in range(height)))
    return self.left(stringPict(slash, (height // 2)))
