There used to be a time, in the early days around 2018-2020, where "AI art" was something that only could have been made by an AI. Very trippy and resembling hallucinations. Sort of like dreams of a computer. I do miss that era of AI art. If you search "early ai art" on Google images there are some good examples.
I bought a book a few years ago called The Artist in the Machine by Arthur Miller[0] and it covers a lot of early AI creativity. I wish they shelled out for more color pages, because I agree things like DeepDream and GAN art are very trippy and would have made it a great coffee table book. It's wild that it took just two or three more years for diffusion models to hit the scene and take the world by storm.