@everephebe I think the words we are using are the problem. ‘Unnatural’ is used daily, to describe things that, in particular, humans have affected or changed. So, ‘plastics’ can be regarded as unnatural, but the products made from them are formed from something that is of nature so ‘natural’; oil is made from ancient forests and so on.
The way the word gets used, which means something to me, relates to activities, rather than things. So, it is actually ‘unnatural’ to bottle feed a baby, but can be convenient, or necessary; we, as clever tool using creatures can effectively create artificial breasts. It is ‘unnatural’ to change how the human body looks, by surgical intervention; but many people feel better for their nose or boob jobs! These practices are entirely human. No other Mammal actively seeks artificial or fabricated solutions to bodily needs. We have the advantage here, although not always the greatest wisdom in applying our intelligence!
My premise is simply, that if nature includes all of creation or the universe, then nothing unnatural can exist as an object, since it is formed from the material of nature anyway. But, there are unnatural practices, or ways of attending to our needs (that come from our artifice and imagination), which in no way essential. It may be satisfying (to some) to have bigger boobs, but it really is not necessary, or ‘natural’.
Having said that, I understand that if we are ‘of’ nature, then our machinations and activities are also in their own ways ‘natural’. So, our evolution includes how we alter the world… Hmmm.