I will do the following five art styles/periods:

European medieval

French impressionist

Cubist

Abstract expressionist

Minimalist

I have chosen these because I suspect ChatGPT/DallE will struggle differentiating between good and bad examples. For three of these I can't tell the difference myself (you can probably guess which ones), and the other two are non-literal depictions that seem like they will trip up the AI.

I'll ask ChatGPT to, "Generate an image of a (masterpiece/amateur) (genre) painting". I'll decide between masterpiece and amateur via a coin flip. I will then post the image, and ask people to guess whether it is the masterpiece or amateur prompt. Each market will stay open for two weeks.

If 3 or more of the markets resolve correctly, this market will resolve as Yes. Otherwise, it will resolve as No.