Return a set of all non-computed aesthetics for this stat.

        stats should not override this method.

def aesthetics(cls):
        """
        Return a set of all non-computed aesthetics for this stat.

        stats should not override this method.
        """
        aesthetics = cls.REQUIRED_AES.copy()
        calculated = get_calculated_aes(cls.DEFAULT_AES)
        for ae in set(cls.DEFAULT_AES) - set(calculated):
            aesthetics.add(ae)
        return aesthetics