This is the root of the ascents and descents discussed in connection with the Partzufim. When they rise above their lowest level to gain higher status, this is their ascent. When they go back down again, this is their descent. This is what causes the changing influences at different times in this world – on weekdays, Shabbat and other holidays etc.
Indeed this was the very purpose for which they went down… For had they been intrinsically lowly such as to require a change in their very nature in order to elevate them, it would have made man’s path very difficult. But that is not the case. On the contrary, they stem from a high root and descended only afterwards. Man’s task is to raise them up as they were before their descent.