#PeaceSellsButWhosBuying
Megan Fox getting plastic surgery at 23.
I would have to say us humans.
Humanity
An example is Michaelangelo's "David."
He discovered a fault in the Carrara marble block from which he was carving the statue which would cause a large chunk to sheer away.
The position of the fault ran through what would have been the muscles of the back.
So Michaelangelo improvised by carving the back much shallower than it would have been in the ideal athletic figure of a youthful shepherd.
If you see the monument in real life and stand to the side of it - the abnormally shallow chest and flattened back becomes instantly evident to anyone practised in life drawing.
There are many other examples, but I think this one probably illustrates the idea sufficiently.
I'm sure Margarite Matisse would have better answers than mine.