I love how you started with the common definition of nature. Some investigation in to the etymology of "artificial" could be valuable as well. By definition, anything manipulated by a human hand is artificial, but does this align with our intuitions about natural / not natural?

btw - I selected your piece for today's #philosophy-review. keep up the great posts! https://steemit.com/philosophy/@aaanderson/the-philosophy-review-nov-29-2016