Humans do that a lot but it's not all we do. Go to a museum that has modern(ish) art. It's pretty incredibly how diverse the styles and ideas are. Of course it's not representative of anything. These works were collected and curated exactly because they are not average. But it's still something that humans made.

I think what people can do is have conceptual ideas and then follow the "logic" of those ideas to places they themselves have never seen or expected. Artists can observe patterns, ask how they work and why they have the effect they do and then deliberately break them.

I'm not sure current genAI models do these sorts of things.