Natural vs. Artificial

Why do people say things made by people are artificial? Why are we somehow outside of nature? Why is a skyscraper unnatural but an ant hill natural? Why is Nutrasweet unnatural while honey is considered natural? We made one, bees made another so why is there a difference?

Man-made is still natural in my opinion. Like yeast in an enclosed area we may be using up all the resources and poisoning ourselves to death but like the yeast, it is a natural process.