There are two time changes per annum under the instant regime: the good one and the evil one. The good one, which comes in the fall, allows a person to live the same hour twice and, more importantly, to sleep an extra hour in one night. The evil one reverses the process, obliterating all that was good about the good one and inflicting a spring penalty on those who enjoyed the benefit the previous fall. There is a Zoroastrian quality to this equipoised duality of good and evil.