 Such a revision may constitute a moral surprise or discovery (Daniels 1996). Suppose, for example, that we are considering whether we should ignore age in the distribution of medical treatments. Many initially believe that age is a “morally irrelevant trait,” just like race, and they would insist that rationing medical services by age is just as unacceptable as rationing by race. On considering a variety of cases, however, it might become apparent that we all age, although we do not change race. This difference means that the different treatment of people at different ages, if systematically applied over the lifespan, does not create inequalities between persons, as it would in the case of race. We might be led by this realization to think that age rationing might be acceptable under some conditions when race rationing would never be, and this would be a moral surprise for many who changed their view.