A perverted mask
Ultimately "equality" does not exist.
At best the idea of "equality" is a moving concept. For example, throughout history marriage was defined as existing only between a man and a woman. Yet today, largely in the name of "equality" our society (culture) is being challenged to redefine "equality" th respect to marriage to include that between members of the same sex.
Essentially "equality" is defined by a society (culture) at a period in time. Thus it is a "moving" idea, always evolving, always changing...
It is like "justice" - in our society (culture) we define this concept (this idea) through governmental action including our courts. But it is never "fully achieved" because the actions of man is always imperfect - thus, how could "justice" ever be fully achieved?
The same as with equality...