The ancient philosophers developed theories about beauty and its relationship to harmony and perfection. These theories weren't applied on the basis of how people actually looked, but how beauty invokes ideals.
But the fact remains that we members of the human species have a lot of “imperfections.” And classical ideals simply keep coming back to make us aware of it. We feel like freaks, “abnormal,” aware of what's “wrong” with us.
And yet, most attempts to describe perfection, ends up being much more creepy than our ordinary freakiness. To really describe humanity you have to describe the freak, not the “perfection.” What's constant through history however is how the freak – the normal person – aims toward physical perfection and in doing so, turns themselves into real freaks.